Hint?

Mao is the name of the coworker, which is strangely close to Maou. Is this a hint to his true identity as the demon king? He would be great as a romance prospect.
Also I seriously don't get why manwhores are so appealing. I mean women who sleep with a new guy every day aren't so why would a male doing so be? Is this one of those things like 'my love can change him' cause I can't think of anything that makes those types be appealing.