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 without having to worry about the downsides belonging to the Sex Appeal trait (as long as not having specified trait).
In Modoc, one can make use of a trick allowing to have sex with Miria several times while having a CH > 6 and a positive reputation in Modoc. After the deed is done, Grisham will barge in and confront them. If male, the player character can attempt to explain away the flagrante delicto as a "medical examination" with sufficient Intelligence. If this works, it's possible to convince Miria to have sex again and again, making it easier to get the Gigolo title. If not - one will be married.