My wife and I have a great sex life and she can get me aroused anytime, anywhere. Sometimes during intercourse however, she stops and offers to help me to orgasm. On these occasions she’ll indulge my second favorite passion which is to masturbate while performing anilingus on her. Sometimes my orgasms this way are so intense I almost pass out, which she enjoys. My concern is, at which point does this turn into a fetish?