So hi ladiesss

I like jerking off my boyfriend and he loves it when I do it. Anything to make my boyfriend feel good lol😭 I jerk him off very often too and every time I jerk him off he always cums and sometimes even twice in a day and it's a lot but I've heard it's bad because he could become sterile and stuff and other reasons. However if I don't make him cum he will get blue balls which is bad as well. What do you ladies do? I don't want my boyfriend to have difficulty having babies in the future but he likes me to jerk him off what should I do ?