Operation: Squeeze Toy 
Sex Dictionary: R
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Randy: Australian term for being horny
rape: sexual activity forced upon someone unwilling or unable to give consent
ream job: licking the anus, also known as rimming
rectum: tube between the colon and the anus
refractory period: Immediately following ejaculation, further sexual orgasm or ejaculation is physiologically impossible during this period of time, which ranges anywhere from a few minutes to several hours and is common among almost all men
retrograde emission: This is what happens when an ejaculation causes semen to back up into the bladder rather than spurting out the penis. Doing this on purpose can be uncomfortable and possibly dangerous.
rim: To use the tongue on the anus
rimming: see analingus
road erection: an unwanted erection that has nothing to do with sexual feelings and everything to do with a penis that has a mind of its own
rubber: a condom