Gavin like dipping his cock into guy's bums. And Gavin has a really big sausage, and the guys like it. So, as much as I hate using this expression, but it is very illustrative, straight acting (oh, I know hang my head in shame for using it, it is almost homophobic) he'd mix with the straight boys down the pub sculling pots of beer, then be up one of them in the dark in the park on the way home. Heaving like a couple of stallions in the shadows, jocks and jeans around their ankles. Gavin liked giving it from behind, so that’s how he’d be in the dark, in the trees in the local park.