i can't speak for t-1 pro because I have yet to try it, but I can speak for SuperOne+. First of all, it's not a good idea to use it if you know you'll be having sex with your girl, unless you take a good shower before seeing her. The best thing to do would be to wait until you get home that night and apply. I find that when I apply close to my armpit it burns, so judging by that; i wouldn't apply in that area.
just my 2 cents.