For Him.

I really don't see what the problem could be. You want my lover to keep coming and enjoying himself, right? I want to make myself look pretty for my new lover, and keep him coming back to stuff his HUGE self into me. 

It's no different than when I do anything else for him before a date. 
I shower for him.
I shave my legs, for him.
I do a bit more with my hair.....for him.

It's all for a purpose. The more I turn on my lover, the more excited he gets, ultimately, the more mess for you to deal with.

I enjoy humiliating you cocky, and so the more sperm milked from my lovers means all the more time I will have to treat you like the cuckold husband you are. All giving me pleasure at your expense.

So, you have to admit, it's all done for you too. You should be happy I trimmed my hair for him. You should be happy I will give you the opportunity to experience me with all 5 of your senses, up close, after being filled by a superior man.

Tonight, you will get that privilege again....