I'm in a relationship and I masturbate:

1) a lot
2) occassionaly
3) rarely

1. I masturbate nearly every day, even though i am in a long term happy relationship, it compliments and is part of my complete sexual experience.
I masturbate because:

1) my sex drive is stronger/more constant than my partners
2) I simply cannot get enough sex/orgasms
3) I am not completely satisfied with/fulfilled by my sex life

Here a lot of 1 and 2 and maybe a bit of 3 for good measure. Love my fantasy world too... and ebing able to explore beyond normal real life safely. A bit of cyber and phone sex makes it all the more fun too.

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Life is intensely passionate