A person whether it be a
man or a woman who only engages in sexual
intercourse or activity when it involves
two other individuals aka a three-way.
Marco:
Julie called me on the phone last night trying to arrange a late-night booty call except I told her it was a complete no go unless she brought her roommate Becky along since I'm a trisexual and require the stimulation of two ladies to keep me excited. Luckily she was able to convince Becky to come along.
Mike: Wow! This trisexual routine seems
pretty legit. I think I may have to...try it!