[sebbie]

I think a lot of this relates to differences in how (straight) men and women are wired when it relates to admiration of your partner by others. For a lot of guys, finding a female partner (spouse) who is attractive enough so that other men like what they see (and then possibly admire you as a guy who was fortunate to find a wife that attracive) is part of the fun of being a guy..this is the "trophy wife thing". And if the wife has a good enough body so that other guys oggle when they see her in a revealing swimsuit, that is a plus not a minus so long as it doesn't lead elsewhere. Few guys would opt for something different (as in a wife other guys think is not particularly attractive) given a choice.

But, female spouses are wired completely differently in this regard, at least most of them. The guy she is married to from her perspective is hers alone, other women stay away. MOST married females would quickly become very upset if they thought there were other women present who were oggling their own guy's body.

So the husband shows up wearing a swim brief at a pool party. From the perspective of the wife, this can only end badly. Either the women at the party think the guy has an attractive body, in which case his body is no longer hers alone but on display for all the women present to oggle and perhaps get turned on by (from her perspective this can only end badly). Alternately, the guy looks not-so-good in a swim brief in which case her husband will become something of a quiet "joke" by the women at the party (Why in the world did he wear THAT when he is so obviously unfit? Didn't his wife say SOMETHING to him about his choice of attire? What is going on in their married life anyway? Tho married is he ATTEMPTING to attract other females right in full view of his wife?).

So. most straight married guys for a host of reasons would not dare wear a brief at a pool party when his wife's female friends are there, and wives buy husbands less revealing suits for pool party wear.