An even grosser twist to this examination could be:
Would you GO DOWN on a chick after she just had someone cum in her?
What if you did, but you didn't know there was a surprise waiting for you..
At a party I noticed a woman returning to the party from the darkness of the back yard with 3 guys, the guys left her one she started talking to a woman whom I presumed was her girlfriend, I joined them and was soon snogging up with the one who had just returned to the party, I run my hand up under her dress and was going for her pussy when she told me that she had been used not long ago, when I got to her pussy she opened her legs, I scooped my finger in her pussy then licked my finger clean, she looked at her girlfriend and said "this could be interesting", we found a quite spot and I went down on her before having sex with her with her girlfriend watching, I soon added my cum to the collection she already had in her pussy.
When we finished she told me that the 3 guys had fucked and cum in her, I know I was not her last for the night either.
This was back in th 1970's BC (befor computers).