Some games are so good, they had to add hot girls. Some games are so bad, they had to add hot girls. But some games have such provacative & irresistable girls, they'll make you feel dirty inside after thinking that you're perverted for a fake girl while you're missing out on a real one.
The list couldn't possibly start without the Metroid series. Samus is a regular part of every classic gamer's wildest dreams. She often appears in the zero suit or in revealing bikinis. She's also respected for going out in the manliest situations. Awesome.
For more contemporary players, the Dead Or Alive series is plastered with the hottest girls. Combine that with the jaw-dropping graphics engines & the Extreme Beach Volleyball spin-off of the series & you've some pretty enticing girls fighting to the death!
As weird as it seems, the Dance Dance Revolution series has gained its share of crazy-hot girls. But it serves it up good, after the DDR Supernova series gave the series background dancing with the character you use. Emi, the starting girl, is pretty hot, but if you select your character, pick Jenny. She not only has very erotic dance movements, but she's clad in a very showy & tight outfit: boots, a long-sleeved shirt, panties, & nothing else. I've seen many a teenager play the game just to watch the tightly-clad, provacative girl.
To watch her go, check this video out (I recommend pausing on hot shots of her) :
http://www.youtube.com/watch?v=h3oPlFmtAhE
If you have any more examples of games with awesome girls, reply to me.