I know this brother (who's not been to the meetings in ages) who was married only for sex. He got divorced after his wife was caught sleeping around. He got married within a year of being divorced, again for sex.
His life is a misery.
I do blame the WBT$ partly, but I also blame him for not leaving this cult when he realised it was one (he told me so). The pressure was just too much for him in the end and he got married again.
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I have known friends that got married when they were in their late twenties and thirties, but got divorced within months due to not enjoying their sex life with their partner.
Sex is part of life, so the joker that only allowed it whilst married should be shot. When going out with the opposite sex (or same sex if that's your preference), sex is a major part of the relationship that you hope to build.
Only being able to experience sex, a major part of your relationship, after you've said your vows is just wrong.
Put it this way, if we were created by a being (still can't believe people actually believe that btw), why did he/she/it give us sexual urges during our pubescent years, only to command us to try and control these urges until we get married? Oh sorry, I forgot, he/she/it likes testing us. Sounds as though god is some kind of dominatrix.
That's my two cents.
RAB