To have
long and intense sexual intercourse which can be compared to
hard training in gym, running, biking,
swimming etc related sports.
Go out on Saturday, pull a girl and take her home. Have some
sex with her. Next morning have some more
sex and give her good ride for 1-2 hours until you are exhausted. This is sportsfucking. It can also happen any give
day and hour, doesn't necessarily have to be on Sunday.