I used to sleep with married women all the time... but under the doctrines of my religion your marraige is irrelevant anyway. Marraige is in line with man's laws so whether I respect it or not is a personal choice. I am only bound by Celestial law.
And just a heads up, if you are married and your woman is holding back in terms of what she will allow (oral, anal, swallowing, whatever) its very possible thats just reserved for her other partner, because in her mind he deserves what you do not.
Most of the married women I have slept with seem to get a kick out of doing that. Just a pattern I noticed.
One woman was married to a doctor and he would be gone for three days in a row at the hospital so I'd spend the night with his wife in his bed all three days, then, if I didn't feel like leaving I'd sleep in his poolhouse that he never bothered to use til I felt like going home in a day or so.
If you have the money to retire and relax thats one thing...
but if you are gonna be at work all day 5 days a week or travel for business or something along those lines, someone is fukking your wife.