Solisexual
One who can only enjoy sexual acts with one singular, particular person. Has been unable to experience pleasure with all past sexual partners and cannot currently experience pleasure with any partner, with the exception of one particular person. Not to be confused with one who is against or dislikes sex with multiple partners (e.g. threesomes).
Janey has had sex with 10 guys in her life, but she can only enjoy it with Will. It's impossible for her to enjoy sex with anyone else being she is a Solisexual.