Let's be honest: You sleep with anything that walks on two legs. Sometimes, you're not even that discriminating.”— Fallout 2 description
Increases the initial disposition of certain characters of the opposite sex, making it easier to pass speech based lines.
In Modoc, you can have sex with Miria if you have CH 8 or CH 7 with a positive reputation in Modoc. After the deed is done, Grisham will barge in and confront the player. If male, the player can attempt to explain away the flagrante delicto as a "medical examination". If this works, you can convince Miria to have sex with you again and again, making it easier to get the Gigolo title. If not - you will be married.