The momentum of the title seems to be about the sex, and not a scene. Bi Momentum opens with a female soldier in Prague returning from a day of work to find her beau on the couch with another man. She breaks them up long enough to get some one-on-one attention from her man. But, as expected, the other male guest joins in and she uses her pierced tongue on them both as they return the favor by filling her holes. The second scene is also all about sex, starting with a blonde in bra and panties and two boxer-briefed lads ready to ladle her and each other with plenty of sucking and fucking action. There aren't a lot of sparks, but the sex is fine.