Am I just *that* much of a boss?

Sabrina
We (as girls) all know the struggle of having sex from time to time and not being able to cum. Whether the reason being having a little too much to drink, or he just couldn't last. 
My boyfriend, on the other hand, will cum every single time. 😏 I like to make sure of it.
My question is, is that normal? That he cums every time. 
Do other girls in relationships (or living the single life) notice that a time or two their SO will just NOT cum?