I rented the XXX BMX for the Xbox and found the controls horrible. It really had no real gaming quality. And yes i did rent it for the nudity out of curiousity and i wish i hadn't wasted the money. It was neat that you could customize the rider you could play but other than that might as well have downloaded porn of the internet. or played sfx Tricky.
DOA extreem volleyball is another game that went for the gonads as appeal. It is more a dating game in my opinon than a sports game. The first time we played it we got to play one game of volley ball. You need to appeal to the girls (buy presents) in order to get a partner. the graphic are great (Go Team Ninja

) but the game itself lacks something to the game play.
If the game is fun to play I will buy it and if it looks good i will try it. I don't mind nudity in a game as long as it isn't the focus of the game and has nothing else to offer. if it is an aside to the game play thats great. Take the DOA fighting games they are great good graphic good controls neat effects (water, snow, enviromentals) they are funn to play and watch. My friends and i like to play them. If the chicks could be nude that would be cool but not neccesary to sell the game as that is not what the game relise on to sell.
No matter where you go, there you are. Buckaroo Banzai