Some people just don't have a high sex drive or don't realise what they can do. Before toys, I was NEVER able to get myself off - so why bother ? It was boring.
I think it's, in general, harder for a girl to "get to know herself" and achieve pleasurable results. If you can't get your body to get into it, what's the point ?
I do believe there are people that don't, for whatever reason. And even if girls that do talk about this with female friends, I doubt most would talk about it with guys that they are not in an intimate relationship with.
If someone asked me if I did, I wouldn't lie, but I'd tell them it was none of their damn business. People who aren't so assertive might lie to avoid having a conversation they're not comfortable with, and I think that's understandable.