It usually 'entails' SEXUAL INTERCOURSE.
Yes it does, or they would have been going against God's word.
Mary didn't seem the type to do that, neither did Joseph.
I certainly hope they had access to the Song of Solomon!
I have a great respect for Mary and her willingness to follow God's teachings available to her during her time.
Therefore I am under the impression she was a good obedient wife to Joseph.