If you are a straight female in a long term committed relationship with a heterosexual male (I can't speak for homosexual males) or a single female who will one day enter into a long-term relationship with one, there are two things you need to learn about men:-
(1) Occasionally, they will, mark my words, commit entirely bizarre and unexplainable acts. I can't think of an example off the top of my head, but when I do, I will be sure to return to this entry and add it in.
(2) When you ask in utter horrid what they were thinking, they will tell you matter-of-factly, "I wasn't thinking." Believe me, ladies, and this will save you lots of anguish going forward. Men are not like women, when they admitted to not thinking, take it literally. Unlike us, their brains are capable of disengaging, sometimes it truly was not thinking, so don't waste your time trying to figure out what they meant by not thinking. It meant exactly that.