Sympathy shag
When a chap moans to wife/girlfriend about the lack of sex in relationship and then she comes on to him resulting in a shag.
Jim: "Had a moan last night about lack of bed jumping and then Sandra came on to me."
Ed: "The sympathy shag - did you go with it?"
Jim: "You bet, but i did feel bad."
Ed: "The sympathy shag - did you go with it?"
Jim: "You bet, but i did feel bad."