Breast orgasms resulted from heavy petting of the breasts and nipples. Women with highly sensitive breast can experience these types of orgasms. Breastfeeding mothers can sometimes experience these types of orgasms as well. (cit. Getting Off by Jamye Waxman, pag 37).
Susan: Oh gosh I would never believe it possible!
Kya: What did happen?
Susan: I was breast feeding my little baby while I had a weird so good feeling... like a real orgasm.
Kya: Ah, wow, it was obviously an full-blown boobgasms, I've never had in my life, oh I wish I could feel the same, lucky you!