Yes, I masturbate daily, sometimes more than once a day.
Yes, I've masturbated at work before. I masturbate in the stalls in the women's restroom in the teacher's lounge. On average I masturbate there a couple of times a week.
I enjoy both giving and receiving.
Last night in bed, just before I went to sleep.
Yes, I love 3sum and have been in several to include MFM, FMF and FFF.