Western oh I'm sorry I missed you question. Well I can't speak for all blokes, but yes at least personally I second guess myself at least as much as other people on here seem to. I think we're probably less focused on things like 'now she's slept with me, is that all she wanted' but we still don't want to seem too needy, or too aloof, and trying to find the right way to act with someone is tough when you still don't know them very well.
I dated a girl a few years ago, and I decided going into it that I'd just be honest, upfront, tell her how I felt - after telling her that was what I was going to do rather than this game-playing bullshit. If I wanted to text her, I'd text her, if she wanted to mail/call me etc, then do it. None of this 'how will this look?' second-guessing angst.
Which went fine for a month or so until she told me she'd got back together with her ex as he had apologised for all the cheating, and she'd been seeing him all along.
So being open and honest can be fine, but you can never tell what someone is thinking. Protecting yourself is good, but that can come across as aloofness. Being communicative can be seen as being too needy. All a bit pants really, isn't it?