Dear Doctor,My wife and I have been married for 15 yrs and have enjoyed a monogomus relationship during that time.My concern is that lately in the course of our lovemaking, I’ve started to orally engage my wife’s anus. We’ve never shyed away from regular cunnilingus/fellatio, but seemed to kind of avoid that area in the past. I have found that I have no aversion to this act, and we both find it very enjoyable and stimulating.My only concern: is it unhealthy? I’m not worried about STDs as we’re faithful to each other. Any response would be appreciated.