If you want an on-the-side definition b), don't be in a classical ltr; look for an open relationship instead.
by sexydimma June 05, 2015
Having an extra sex partner. Having sex with a friend as in friend with benefits while in a relationship with someone else.
by Frisco Stories August 12, 2008
Having a sexual relationship with a person outside of one's primary, emotional relationship.
by Nathan V. August 07, 2008
by Nikkola March 06, 2005
by mattoincapace October 16, 2005