Afraid I'm in the frequent DIY mode.
Like others, first preference is that the girl gets me to come. There are some that have no problem with this - though for me, coming during sex is rare, and I actually way prefer oral or a *good* hand job to sex really.
But there are others, some regular, where despite me enjoying the session and having loads of pleasure, I know I won't come and have to use the tried & tested technique. While it's not perfect, it's hardly the end of the world, and the journey there is still brilliant. Doesn't mean they can't play with my balls to enhance what's going on, of course!