I have a penis. I most often use it to pee with, sometimes i use it to make love to another man with and sometimes i simply ues it as a stress reliving toy. If i wanted to reproduce i would use for that. One organ many uses.
Sex is analogus to this
A married couple has sex thousands of times over their lifetime but only have a few children.
One could conclude that human sexual reproductuon is a horribly inefficient process or that reproduction is a secondary function of sex just like sex is a secondary function of the peing penis.
The first use is to create a close bond between two people for the purpose of child rearing and improving the chances of material and psychological survial.
Even though i cant reproduce with another man i am still driven to find a mate because it is a strong human need. I have been in such a relationship for thirteen years, both of us have derived great beifit and joy from this.
It is exceedingly cruel forthe someone to try to dictate celibacy on people shuch as myself or to call such a beautifull thing "sin" and conflate it with the most heinus things imaginable.
I think this obsession that fundys have with sex and their insistance that it is always dirty and sinfull, even if someone just thinks about it, is to create false guilt trips and to misderect sexual extacy into religous extacy.
Ex: teenage boys are going to masterbate... it is a force of nature!
Tell him that it is a dark sin and seething perversion and most shamefull. He will do it and he will feel great guilt and shame which will drive him into the church where they
have the solution tothe his problem. He goes there, eats a few cookies, drinks some wine, says a few p. prayers and tells a priest all about what he has done. The priest reinforces how terrible thing is and absolvs him. He is now ok.....untill next time....