I've noticed that after reading fan fiction for nearly two years, I no longer find excessive sexuality all that distracting.

Well, I wouldn't say that I've gotten to the "comfortably numb" stage yet. But yes, I know what you're referring to. Actually, reading so much great fanfiction with good sex scenes has mostly just made me much pickier about the quality of the erotica. To really pull me in and interest me, the sex has to flow out of strong characterization, and be very well described (and also be used as a "tool" in the sense that [Unknown site tag] means, above, in terms of carrying forward the story).

I didn't used to have such high standards before I joined this fandom. Of course, this fandom has more high quality porn/erotica than I was ever exposed to, before.