A strong Yes!! to both questions.

Masturbating is almost a regular occurance when my husband and I have sex. He loves watching and I totally get off and performing for him so I put on a little show for him very frequently.

Other than that, though, I have only masturbated when another person was in the room one time.

My husband, who was just a boyfriend at the time, invited his best friend over for a night of drinking and videos. Well, to make a long story short: the friend fell asleep on the living room couch and, as usual happens when I drink, I started feeling frisky so I began teasing my husband by playing with myself over my clothes. Before long I was buck-ass naked and fingering myself for all I was worth on the living room floor while my husband's slept just a couple feet away.

Even though the guy never saw anything, just the idea that he could wake up and catch me had me turned-on like nobody's business.