a posh wank - Wanking with a condom on because you're too clean, too posh,

Wanking with a condom on because you're too clean, too posh, and too high maintenance for a normal wank.

I wore a condom because I didn’t want my wank to be seen by my cleaner.

I wanked with a condom like I was doing a presentation.

I wore a condom so my wank would look like a top-quality pizza.