Sex. It happens every day. All around the world.
The average person will get cummed in by 14 people in their lifetime.
A study performed by TGO State University shows the breakdown of the different individual groups who generally do the cumming, and how often;
Other relatives- 19%
Spouse/Life partner- 12%
Random people- 9%
Animal (domestic)- 3%
Animal (wild)- 2%
Inanimate objects- 1%
Does this data line up with your receipt of cum?