Reverse half-and-half is a term for a sexual act in which a couple has penis-in-vagina sex, finishing the act with fellatio and ejaculation into the female partner's mouth. This sex act is a variation on the act called half-and-half, where the female partner performs fellatio prior to sexual intercourse.
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This term's origins are unknown, but it was added to Urban Dictionary in 2003.
More About Reverse Half-and-Half
The term reverse half-and-half is used in the sex industry to refer to a type of sexual service that people may request. However, it can be practiced by any couple as a form of sexual variety. Because this sexual act carries significant risk of STI transmission, a condom may be used.