Hi, Jack. Talking about sex songs, first one which comes to my mind is George Michael's "I Want Your Sex"
So straight? Or maybe Def Leppard stuff might help such as Pour Some Sugar On Me, Animal, Rocket. Or Led Zeppelin's Dyer Maker. If you want romantic mood how about Chicago songs such as You're The Inspiration or Foreigner's Waiting For A Girl Like You or Almost Paradise from Top Gun soundtrack.

Bye Jack, Von Yoyage.

Susumu