carnal activity where three people are engaged. A troilist is an individual who, in such a union, likes being involved in heterosexual acts with a partner in addition to watching the partner in carnal activities with a third person. The third individual might be of the same gender as the partner or the troilist. If the third individual is of the same gender as the troilist, only observation takes place. If the third individual is of the same gender as the troilist
TROILISM: "While most people are surprised by troilism, especially when their friends are involved, this isn't terribly uncommon."