This led to some interesting discussions about what can happen on your way to first base: This can include the butt.
When you're ignoring his or her main event space, there are other locations that become incredibly sexual. That place where the butt meats the thigh—it might a well be called Las Vegas because it's Sin City down there.
My then-girlfriend proceeded to give me the most involved, sensuous back and neck massage; it left me incapacitated.
One of my favorite romantic memories, and I won't betray the perpetrator, happened in my kitchen, and it wasn't even close to first base.
I was standing over the counter, engaged in some kind of food prep (for some reason I did not have a shirt on), and all of a sudden I felt these hands on my neck.
This one may also be cheating, but whatever; sue me.
It is essentially a non-handjob handjob and I suggest only busting it out when you're ready to go past first, or you are going to have a very frustrated little man on your hands (or all over your hands).
This basically involves getting your dude on his back, or sitting down, and then making a ring around his Dude with your fingers, and stroking it gently.
This is where you get naked, in bed, and just lie with each other, petting but no more.
It's hugely erotic to feel the excitement of every inch of your partner, all the while knowing there's only so far you can go. I was giving my then-GF a backrub, and every time I moved down past her shoulder blades she would moan.
At some point when I was in college, my friends and I entered into a pact: For a month, no matter if we were girlfriended, single, or other, we would not go past first base.
While there was some debate over where first base ended and second base began (I was pro-boob touching; my friend Mike thought that hands shouldn't go above the tummy or below the neck; my friend Dan argued that "gay first base" was different), it was generally agreed we wouldn't go past making out.