Should I not jackoff if I want to gain muscle?

Sexual habits are formed in humans from the first time they engage in that type of activity. So, if you masturbate and come to ejaculation quickly, you will be prone to do that when you are actually with a girl. That won't bring much pleasure to her and it will not bring as much pleasure to you. Sex is a fire and marriage is the fireplace. If you have the fire in any other place than in the fireplace, your whole house will burn down.

My suggestion...repent and turn to God Almighty! Turn from your soul sick ways!