Why not just sleep with them all, if that's the main reason you want to get with them. Afterall, since there has been so much debates about how being a female slut is ok, then being a male that has a lot of sex isn't bad, either.
Why not just date one? Feelings are going to get hurt if you do this and it really isn't right to date a lot of women all at once unless they know about your promiscuity and are ok with it.
I do this sometimes but recently have been getting tired of doing this. But I understand where you're coming from. If Im dating a girl and I see another hot girl that I like I will more than likely dump the girl Im going out with and date the other hot girl.