Anything that isn't country is okay. Really.
You know the saying "If it's country, it ain't music".
Now, to get serious...
The music I really want in strip clubs is the music you never hear. You want music that enhances the sexual, erotic, hot atmosphere. You want slow, grinding, funky, nasty, sex music.
Now rap, funk, rock, whatever, is all fine. I love it. But for a strip club you need sex music. Music to fuck by. Music to get jacked off by.
I have this vision of a strip club with (of course) insanely hot girls, all dressed up in super tight, slutty ankle-length gowns. Tube dresses I think they're called. The fabric is so tight and thin and almost see-thru that you can see the outline of their nipples. They all look like the hottest 1950's glamorous sex kittens.
The lights go down, and the DJ starts playing Led Zeppelin's "Kashmir". The whole fucking place shakes with John Bonham's drum beat.
Spotlights on the stage, and one by one the hottest strippers on the planet slink out onto the stage, slowly dancing and teasing and just oozing hot sex. They dance and pose for a bit on stage, giving the whole audience boners, then one by one make their way to the floor and give each guy in the audience a super hot lap dance. The whole room turns into a super high mileage lap dance room, everyone getting sucked and jerked and fucked.
That's what strip club music should be. Instead it's some throwaway crap that merely gives dancers something to dance to.