Why did God invent sex? (Part 1)

Really now? If it was just procreation, couldn't He have made a simpler to do it? Why not let the man only ejacualate when HE wants for a change? Tired of semen now. Over the course of my life, semen has never been my friend. Girls are too fertile nowadays so I wish the male pill would come out in time for marriage. Just my thoughts. Not the views of the church. And why didn't God make orgasms last longer? Why can't we have sex at 90? I think it's unfair. Sex only between the ages of 6 - 70. Oh well but our God is sovereign. Just an idea. More another time.