Sex that is low effort and relatively straight to the point. Often (but not always) takes place first thing in the morning or as a byproduct of cuddling.
We layed in bed all day and ended up having lazy sex
When a person is straight, but that person is too lazy to go look for a soulmate anywhere, even if a person of the opposite sex is right in front of them or to the side of them every day. (for some people its different)
Connor: Is Justin gay?
Eric: No, he seems to just be lazysexual.