u/yummypanda-111

So my boyfriend and i have sexual intercorse everyther week. Hes 28, and we started dating 2 years ago. Im his first everything. The problem is when we have sexual intercorse his erection keeps going up and down. I also get wet easily, and he says he has always been used to his hands so its hard for him to get used to me.
Sometimes we do it once a month because it gets me so annoyed his erection goes up and down.
Anyways is this normal??? Hes saying its common for guy to go up and down during sexual intercorse.