Here's my advise. Have her walk into the hotel room in front of you. Have a small steel pipe hidden up your sleeve. Smash her over the head with the pipe and knock her out. Pack a small saw in your suitcase. While she's knocked out, dismember her body and put it in a trash bag. Take the bag and dump it in a dumpster. Once that's done, sneak back to the room, clean it up, and call an escort service. Have a girl sent over. Have sex with her and then repeat the process of killing and dismembering her. Start over again for as many girls as you want.
Or....you could just fuck your girlfriend in the ass.