I actually feel really bad if a girl has to suck my sweaty dick after dancing/going out/walking around and I feel like she'll be more down/appreciate the effort if I take a quick shower.

That said, how can I do this without really killing the mood?

Edit: Would just saying, "I feel gross, I'm going to take a quick shower", work? I feel like it's good. Then take a cold shower like someone suggested and be literally two or three minutes, tops?