The redeeming feature of sex is that if it's with someone you love it is an act of giving, intimacy, vulnerability, trust and mutual pleasure. That's not ridiculous. That's not foolish. That's not a source of shame or ennui. It's a shame you feel that sex has to be either for procreation or for essentially, partnered masturbation. Have you ever had sex with someone you truly love? It can be spiritual, it can be enlightening, it can be true intimacy. The Tantric sects in India knew this. But you don't have to be religious to appreciate it.