Answer:
That really all depends on the preference of the people involved. If the person giving the lap dance likes dance music, and the person getting the lap dance doesn't really care, then dance music it should be.
If the person who is doing the lap dance doesn't care what music is to be played, and the person getting the lap dance likes Rock-n-Roll.
Then, Rock-n-roll should be played.
It really depends on the mood, that should be taken into consideration as well.
If you are in a relationship, and the two of you have had a nice romantic evening and if your significant other wants to do a lap dance for you, then probably something nice and slow. If the two of you share a favorite song, that's also an option.
Then again, if it's one of those spontaneous moments and the two of you just feel like being naughty I'd suggest music like "Sex & Candy" by Marcy Playground.
Or if you are in a really lusty mood "More Human Than Human" by White Zombie.
But, again...those are just my personal preferences. You may hear those songs and not like them for that situation at all.
So just go with what (ideally a compromise of what both like) does it for you.
Hope this helped.