Masturbation or solo sex is thought to cause weight loss because it results in an increase in heart rate and blood flow. However, masturbation does not cause weight loss since the entire session only burns around 6-15 calories.
To lose weight you need to engage in an activity that burns calories for a sustained period. For example jumping rope burns 10 calories each minute and when it is done consistently for 15 minutes a person can burn 150 calories for each session.
It is therefore best to chose a weight loss method that burns a considerable amount of calories like jumping rope and other aerobic exercises like running or brisk walking. Weight bearing exercises are also important since they burn calories and build muscles which continue burning calories even after the exercise session has ended.
A dependable weight loss program should also include a diet plan with consumption of low calorie foods like fruits and vegetables. Lean proteins like fish, beef and beans are other good food choices for weight loss.
Eating these low calorie foods and engaging in an activity that burns a considerable number of calories will enable you to be in a calorie deficit which is the the only way to lose weight since you would be using more calories than you consume and this will force your body to burn fat to make up for the deficit.