Club O is the best, for sure. However, the original poster asked about other nude beaches. Cupecoy gets a fair amount of nude use, and as someone said, the sand comes and goes there. Happy Bay does not have car access. You have to walk in from either Friar's or from Grand Case or take a cat trip that stops there. Neither place has any restroom facilities and there may or may not be guys set up there on either beach, selling food and drink. So you should plan on taking at least some drinks with you. As far as 'mainly male', nude beaches on SXM aren't like that. Cupecoy has the reputation, sometimes earned, sometimes not, of being the 'gay' beach, but there is generally always a mix of sexes there, as well as at Happy Bay. Do NOT go to Happy Bay on Sunday expecting to be nude, as there will usually be a reasonable amount of local families on the beach on Sundays, and they do not appreciate nudity.