Basically a sex bell, or love bell as some people may call it is. a bell worn on a necklace or collar as some may prefer that. the bell rings while having sex. thus the term sex bell.
Guy: we should get you a cute kitten collar

Girl: oh yeah thats so cute.

Guy: haha its gonna ring when we have sex.

Girl: Oh so it'd be a sex bell

Guy: yup. >.>

*5 mins later bell is heard ringing rapidly*

see sex bell
by Reiny May 2, 2008
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