Be honest dude. Why would you start of a relationship (Im assuming thats what your going for) with a lie? Honestly, whats this chick gonna say? "Ew youve never fucked one of the many sluts I hate? Nevermind", No, if anything she'll be glad you aint as dirty as a truckstop glory hole. And if shes asking you about something like that shes obviously into you. Jump on that shit before she moves on.