A friend of mine told me about a lube called "Gun Oil" that she says works great. But then again, she's into strap on play, so she'd know.

I've only got one thing to add to this thread, and it's always fun. If you're in the drugstore for whatever and the girl at the counter is a cutie, buy a box of the biggest condoms they have. Be completely congruent with the "normal guy" vibe. No acting like a poseur, or snickering, or whatever. The fun is watching for reactions in the girl. They'll be subtle, because she'll be trying to keep from looking like an idiot herself. Eye dilation, doubletakes, etc. Always fun. Even better if you add a bottle of Nytol and a baby doll or one of those drug store generic Barbies.