Fendy
Derived from the word Friend and you take the R(relationship) and I (intimate)out and you have "Fendy".
A suitable descreet arrangement that exist's between two consenting adults involving only sex and no excuses and never having to say you are sorry.

VERY IMPORTANT: Not to let "Fendy" stay the night otherwise emotions may develop!
Your regular friday night Fendy (visitor)

who comes after dark when your teenage kids have gone out to party and who leaves before the sun comes up and the kids come home.