LMAO I've never whipped it out randomly but girls definitely seem to love feeling that you are hard when they are dancing against you.

I kinda hope that there will be a bunch of guys just pullnig it out in the club. Would be fucking hilarious. But on a serious note, if you're in a private locale, and you have already started to build attraction and escalate it certainly can be a way to speed things up.

I've done it several times with girls who were moving slowly. you whip it out and at the very least she'll be a bit embarrassed and when you take your hand off it and start making out again when she gets all hot again she'll go right for it without hesitation. It's old news, she's not going to be worrying you aren't comfortable with it.

It has worked for me every single time. Its during passionate kissing, and I move her hand down to touch it through my pants. She will normally grab it then I pull it out. I'll at least get a blow job out of it.