Someone said :
get off ye're high horses ye lot! are ye telling me NOT ONE of you has ever had casual sex? ya and lovelace is still a virgin!
We are not talking about casual sex though... we are talking about starting a relationship of a certain type.
Casual sex does not qualify as a "relationship" even if technically it relates 2 people for a short period of time.
We are not talking about fuck buddies either.
The idea is that the relationship could end up to remain in place, even if no feeling have grown out of the test drive.