Sesquisexuality
Definition. A sesquisexual person is one who is indifferent between having sexual intercourse ONCE with a (generic) person of the opposite sex and having sexual intercourse TWICE with a (generic) person of the same sex.
Remarks. "Sesqui" means "one and a half" in Latin. For instance, a sesquilinear form on a complex vector space is an R-bilinear form which is C-linear in the first variable and conjugate-linear in the second variable. The motivation for the terminology is as follows: a sesquisexual person in the sense of the definition above is more or less in the middle between a homosexual person and a bisexual person.
Homework. Please tell me how to say "one and twenty-seven fifty-ninths" in Latin.