[There's the slightest tenseness to his smile when he's called out, otherwise he doesn't flinch. In his mind, he wasn't caught in the lie until he's run his pursuer around the block once or twice.]

Apparently it's some sort of energy that gets let off when people get frisky.

[he says it with a completely straight face- also because, as far as he can tell, that is the truth]

You know? Handsy? Hanky-panky? Looking for the snake in the grass? Locking lips or legs or whatever.

[Now, with the most innocent look he can manage (which isn't very, to be honest, his eyes are still twinkling),]

You're not a virgin, are ya' Mister?