to somehow get a penis between boobs. whatever position you want or desire. a Bed. a couch. on the floor. made more for bigger boobs. Most men do not ever try them. Some men prefer titty fucks to actual sex.
a very desirable sex act men want to do to women and some girls with bigger boobs or big boobs. its to take the penis and stick them between the boobs. Some men find this very pleasurable and addicting.