You can certainly go on beaches with straight men, women and children so long as you don't get these swim briefs wet. Go in the water or stand in the rain and you will cause offense. Offended husbands and fathers can get violent or call the police, and everyone has mobile phones these days.
In SW France there are beaches where you can have a couple of miles of beach and dunes to yourself, that is the kind of place you can wear see through swimming trunks, over a hundred yards away no one can see that they are see through as you come out of the water. Anyone seeing you can choose to come closer or avoid you. There's enough space for everyone to do whatever they choose without causing offense.
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