...ah, the graphics, indeed! The major draw for BMX XXX (shortened as, um... BMX4?) is the 'ecks-ecks-ecks' part at the end. With a tag line like 'Keep it Dirty', it almost seems like the box's black background is specifically to help contrast and highlight the white 'Mature' ESRB Rating.
The game delivers on the 'Mature' rating, with Comic Mischief, (CG) Nudity, Strong Language, and Strong Sexual Content, just as the ESRB description on the back states. There are even FMVs with live video footage of strippers (exotic dancers) from a real strip club called 'Scores'. These video clips are your reward for advancing in the game (or finding the correct cheat codes on the net or in a magazine - not extremely difficult... at least two of the codes are prominently printed on the game case...)
The thing is, the live video FMVs are choppily directed and are designed to tease. In fact, only the very last (you-completed-the-game) video actually shows tits (um, breasts). None of the earlier videos have the strippers even getting topless. (That's why I said 'exotic dancers' instead of 'strippers' above. They don't actually strip much - and any dance done with a BMX bike HAS to be exotic, right?!)
In-game graphics are not as extremely detailed as some porn-dogs out there might have hoped, but the in-game is all about the 'tongue-in-cheek' factor. This is where the Comic Mischief and Strong Language come in.
The music is pretty good, with some familiar bands playing some pumping sound tracks to keep the BMX fun moving.