1. Sex (vaginal, oral, anal, etc.) that is had, NOT because the person necessarily wants to, but because he/she feels that he/she needs to fulfill their partner's needs.

2. Sex (vaginal, oral, anal, etc.) that is counted towards a couple's sexual quota.
"Joe and I haven't gotten it on in a week. I just haven't been in the mood, but I think that he deserves a little moral sex."

When you eat dirt for the first time and leave your family to build a shack in the woods

1. Sex (vaginal, oral, anal, etc.) that is had, NOT because the person necessarily wants to, but because he/she feels that he/she needs to fulfill their partner's needs.

2. Sex (vaginal, oral, anal, etc.) that is counted towards a couple's sexual quota.