Relative

Marriage changes passion Suddenly you are in bed with a relative.
Who’s an apple’s favorite relative?
Granny.
There was a young woman named Bright,
Whose speed was much faster than light.
She set out one day,
In a relative way,
and returned on the previous night.
Physics is like incest.
It’s all relative.
Roses are red, Roses are blue
Depending on their velocity relative to you