Those types of women are attention-whores. They're doing it for the camera and to get free drinks from sleazy "straight" guys. They were possibly hired by Smirnoff to make out in a homosexual fashion for men who can't come to terms with their own homosexuality.
Moreover, homosexual is homosexual. Two women together is just as homosexual as two men together. A man's perception of it is irrelevant as the word is defined by the content of the act.
Can I suggest that you watch the MTV movie awards that were on at the weekend. There was a category called "best kiss". Two guys won it. Watch it and get a hard-on.