WARNING! This is a bit TMI (multiple orgasms)

I want to be able to have more than one orgasim while having sex or just masterbating. I always try for another but I just end up giving up. I tend to finish much quicker than my fiancé so the sex  just gets boring for me. Has anyone ever experienced more than one? How long did it take after the first and and what can I do to train myself into having more? I know this is crazy just work with me lol.?