For seminal discharge / ejaculation adequate stimulus is necessary. Over weight means how much? Any issues with arousal? Any way if you are able to reach climax, which is more a brain related activity, you need not worry so much. You cannot will climax or discharge. Best is to relax, go with the flow of sex and enjoy!
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.