The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
Is Sex Good For Weight Loss?
Sexual activity does burn calories and can contribute to overall physical activity levels, but it's not a primary weight loss strategy on its own. While sex involves physical exertion that burns energy, sustainable weight management in the UK requires a combination of regular exercise, balanced nutrition, and lifestyle changes. For most people, dedicated physical activity and dietary adjustments are more effective for weight loss than relying on sexual activity alone. If you're considering weight loss medication alongside lifestyle changes, use our free BMI calculator to understand your starting point and weight loss goals.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
How Many Calories Does Sex Burn?
Sexual activity does burn calories, though the amount varies significantly based on intensity, duration, and individual factors like body weight and fitness level. Research suggests that sex typically burns between 85 to 250 calories per session, with an average around 100–150 calories for most adults. This is equivalent to a 15–30 minute moderate walk for many people. However, this calorie expenditure is inconsistent and highly variable. The intensity and duration of sexual activity fluctuates naturally, making it an unreliable standalone weight loss method. For sustainable weight management in the UK, the NHS recommends combining regular, structured physical activity—such as brisk walking, cycling, or swimming—with a balanced, reduced-calorie diet. Sexual activity can contribute to overall daily movement, but should not replace planned exercise routines.
Clinically BackedWeight Loss
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How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Sex, Exercise, and Weight Loss Strategy
While sex contributes to daily calorie expenditure, effective weight management requires dedicated exercise and dietary change. The NHS recommends at least 150 minutes of moderate aerobic activity per week, which burns significantly more calories than sexual activity alone. A realistic, sustainable approach combines regular physical activity with a calorie deficit of approximately 500 kcal per day, which typically results in losing around 0.5 kg per week. For some people, prescription weight loss medication alongside lifestyle changes may support weight management. Our GLP-1 weight loss calculator can help you explore how medication combined with exercise and diet changes might support your goals. Always speak to your GP about what's right for your individual circumstances.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Does sex count as exercise for weight loss?
Sex provides some physical activity and burns calories, but it's inconsistent and typically burns less than structured exercise. It can contribute to daily movement but shouldn't replace planned workout routines. The NHS recommends 150 minutes of dedicated moderate activity weekly for effective weight management.
How many calories does sex burn on average?
Research suggests sex burns approximately 85–250 calories per session, with an average around 100–150 calories. This varies based on intensity, duration, body weight, and fitness level. For context, a 30-minute brisk walk burns similar calories more reliably and consistently.
Can sex alone help me lose weight?
No. While sex burns some calories, it's too variable and insufficient for meaningful weight loss on its own. Sustainable weight loss requires a calorie deficit through diet and regular exercise. Your GP can discuss what combination of diet, activity, and possibly medication suits your needs.
What's the most effective weight loss strategy?
The NHS recommends combining regular physical activity (150+ minutes weekly), a balanced reduced-calorie diet (approximately 500 kcal deficit daily), and behavioural changes. For eligible adults, prescription weight loss medication alongside lifestyle changes may be considered. Use our BMI calculator to understand your starting point.
Should I rely on sex for weight loss?
No. Sexual activity should never be a primary weight loss strategy. Focus instead on structured exercise, balanced nutrition, and sustainable lifestyle changes. If you're struggling with weight management, speak to your GP about evidence-based approaches, which may include medication, diet support, or referral to specialist services.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.