infidelity 

unfaithfulness to a sexual partner.
Lack of loyalty or religious belief

infidelity by Mmm SeanPaul September 25, 2003

masturbatory infidelity 

Cheating on your right hand by whacking off with your left hand. Whether it be due to feeling like you're getting some strange or because you are seduced by your left hand wearing a sexy glove or mitten,it's still cheating.

I fell victim to masturbatory infidelity in a moment of weakness. I saw that sexy Dora the Explorer band-aid on my left thumb and couldn't help myself.

masturbatory infidelity by wolfbait51 June 4, 2011

infidelity 

a threesome you weren't invited to

She said she wasn't committing an infidelity, just that I wasn't invited to this ménage à trois. She promises she'll take me alpine skiing with the next guy she picks up.

infidelity by partytrap February 24, 2013

Infidelity 

Going outside of a monogomous relationship for sexual intercourse, companionship, or attention. Cheating.

Infidelity is a nicer way of saying my wife makes my tuna with other guys' mayonaise?

Infidelity by needmaps June 18, 2012

infidelity 

s a violation of a couple's assumed or stated contract regarding emotional and/or sexual exclusivity

most marriages end due to infidelity

infidelity by AOHARURIDE October 25, 2015

insedelity 

A word used to describe someone who thinks too much or someone who has gone quiet and sat in the corner of the room staring at a blank spot on the wall for no reason. They are said to be "In insedelity" not "insedelic" etc.

I think Silent Bob never talks because he is in permanant insedelity

insedelity by Jay & Silent Bob July 4, 2004

negotiated infidelity 

How to fuck another woman and your wife at the exact same time.

A negotiated infidelity arrangement = a sad state of affairs.

negotiated infidelity by aboynamedpseu August 7, 2010