Do guys like when their girlfriends tell them about pleasuring themselves?

Yes. My girlfriend and I are apart a lot because of work related travel. I find it to be a big turn-on when she tells me about how she masturbates thinking about me while we're apart.

Typically guys love hearing anything you girls do by yourselves sexually.

We mostly do, it's kinda hot knowing your doing such a thing.

I agree that it depends on the guy, but my guess would be yes.

Conversely, do girls like it when their boyfriends tell them about pleasuring themselves?

I will say yes, if it's done in a reserved way.

Every guy I know would be pretty into it. Myself included. There may be some insecure guys worried about why you need to pleasure yourself instead of having him do it for you... but that's a crock. I guarantee he's still pleasuring himself while you're in your relationship.

If it makes him feel better, and you're comfortable with it... let him watch or participate (without having sex, obviously).

Hard to say without knowing the guy. Some guys may be jealous you are pleasuring yourself and may feel left out or obsolete. Some guys may get really turned on by the idea of it.