a sexual act or move in which a man fucks his partner in the vagina and the anus in turn, ie first in the vagina, then in the anus, then again in the vagina and so on.
The ultimate form of bisexual intercourse involving both sexes,(usually in a threesome) simultaneously. This requires the usage of the vagina, as well as the anus.
As the girl experienced vaganal for the first time in her life, she realized that she regretted becoming a bisexual...it just wasn't good.