There are so many situations to "mask" one's real intentions. Imagine how in business negotiations, sometimes you have one partner nodding politely and smiling at his partner while he plots how to back stab him or her.
Then there's the average girl who covers the shadows under her eyes with concealer so that you wouldn't see how tired she really is. Make up is like a weapon when she's wearing it and sometimes a weakness when she takes it off, worried to leave the house or be seen without her "mask"
But there are some things not worth trying to hide when you're in a relationship and it's your true face and real nature. If you try to be someone you're not, it catches up with you. If your partner is eventually going to find out what you're really like, may as well start by being yourself right?
For instance, when a guy puts his best foot forward when he's trying to impress a girl, he might try TOO HARD. Problem with that is over time, it becomes unnatural and difficult to maintain this front.
I actually know a couple of guys who do the opposite (using lesser cars on first dates and playing things down) so that a girl would hopefully like them just for them. Takes a certain amount of security to do that.
Considering we often wear "masks" at work (for me it might be smiling non stop for an ad till your jaw hurts but it's work so you grin and bear it ;) it's important to come home and be YOU or to have friends who you can be yourself around because they keep it real and tell you off if you step out of line.
Well, all this talk about masks makes me wanna wear my honey and oatmeal one! :) Those are the only masks I wear at home okay? *chuckle* and if you don't believe me, ask my pugs!! They really know ME ;)