but there is some variation.  Some gals see a problem with the tip of the penis coming into contact directly with their labias, so they postion the tip of the penis to be just above the clitoris so no ejaculant will land on their vaginas.  Also, if the penis tip is rubbing against the vagina itself, the possiblitly of insertion looms.  Of course if you wear a condom, that problem goes away.

I find that the sensation of the penis tip against soft pubic hair to be intensely desirable, especially if the hair is drenched in some kind of cream, shampoo or oil.

The last thing I would want to rub up against however is stubble, so check for that first.