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Maybe it is because I am gay, and I am super sensitive about having children wander up, I am pretty anti-public sex. And, even if I wasn't anti-public sex, I must say, the beach?
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Sand. Sand and dirty water. Don't get me wrong, the beach is tres erotic (as the French Surrender Monkeys say). But more in a cerebral way. You know, the "aren't they attractive", "spread some lotion on me" kind of way. But primarily in the "let's move this into the house and a shower" kind of way.
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It only takes sand in your trunks once to realize it is a bad idea. Maybe enough people haven't grown up close to the beach as I did.