So the punchline is… Pull out your dick and piss in her mouth because…

She’s a public bathroom?
I don’t think I get horny post comics.

I chuckled a little.

I took it as her being aggressively kinky and provocative to tease and embarrass her uptight partner, nothing says one way or the other as to if she’s really into that sort of thing or just messing with him since he clearly wouldn’t go through with it, and the punchline being his flustered and mortified reaction rather than just the sexual innuendo.

But the artist wasn’t shy about playing up the horniness and titillation either.

However, that’s not the only way to look at it, and it’s not like we’re dealing with Shakespeare here.

Alright I think I got over the ick factor enough to just see this as a pretty good answer to this.