Hmmm.... I want to voice a modified version of it.
The real trouble is not the forest of doublespeak and taboos surrounding sex. Sex is, so to speak, the easy part. Once you find a compatible partner with whom you can communicate solidly about your relationship (see below), your meatware substrates come pre-programmed for the sex act itself ;-).
The problem is the forest of doublespeak and taboos surrounding basic human fragility. There's almost a bizarre, hypocritical handshake protocol here: to meet someone and make friends with them, you generally need to appear well-put-together, sane, and just generally competent at life -- all without seeming smug or overconfident or douchey, either. This mostly involves scrubbing off the parts of your self-projection to others that don't fit what other people think of as "competent at life".
Problem is, deepening and maintaining a relationship, romantic or otherwise, consists precisely of letting your guard down and showing your baggage. Your positive baggage too, not just the negative.
Among more reticent social groups or cultures, people rarely manage it at all. They're never willing to let their guard down or exchange baggage, so they go through life with a series of shallow "friendships" and "relationships" that keep seeming Just Fine until they abruptly end because there wasn't a strong enough bond to take even a feather's new weight.
Then you hit some arbitrary "getting older" age, look back, and realize you spent your youth fucking around, have few friends, and no marriage. Whoops, time for the Biological and Parental Expectations Clocks and the sudden run to the altar! In another couple years, time for a divorce!
Source: I have fairly close ties to most of my friends and I've been with my fiancee for going on five years now.