An Ex that you're still friends with, and occasionally hook up with. Different from a fuck buddy because you have history and also enjoy their non-sexual company.
"We're not getting back together, I just like having him around... especially at night. He's just a sexfrex I swear!"
by OSUgirls February 24, 2014
"We're not getting back together- he's just my frex"
"I got really grunk last night and my frex turned into my sexfrex... whoops"
"I got really grunk last night and my frex turned into my sexfrex... whoops"
by OSUgirls February 24, 2014