A theoretically straight man who likes to "sit back and get serviced" by gay/bi men, with little or no sexual reciprocation. (Note: It is specifically the lack of interest in reciprocating that defines a man as "trade.")
"Hey, Adam, I hooked up with that married guy who answered my M4M ad on craigslist!"
-- "Wow, Steve, I didn't know you were into chasing after trade!"
-- "No, dude, he turned out to be just as horny for my cock as I was for his... I don't go for those 'no-reciprocation' trade scenes."