I’m relatively inexperienced when it comes to sex but I know my bf enjoys everything I do in most positions. However, most of the positions where I’m comfortable are ones where he has to put in a decent amount of effort. He tires very easily though. I know that I’m not very good on top at all. I can never seem to find a rhythm and figure out whether I should be grinding or moving up and down and I just end up feeling clumsy and he doesn’t really seem to like it. I really want to be able to make him finish from being on top because I don’t want him to get so tired every time. Can anyone explain it to me in the clearest simplest way possible? Or attach an instructional vid or something?