I guess maybe I am an exception to all your points. I got married after I had run around a bunch of times with other women, all while living with my now wife. She got feed up with all my cavorting, and did a friend of mine. All that was prior to our marriage, but during our relationship. It did leave some baggage to deal with later on.
As for HD vs HD, that worked well enough. I had a long relationship with a HD girlfriend who rivaled my sex drive. We quickly realized that we would drive each other into an early grave if we didn't regulate our lovemaking. So, we settled into a once or twice a day routine - mornings and night before bed. If we had spare time, we would sometimes do more. Having said that, we were both young (19/20) and had a lot of spare time and energy. Eventually our relationship waned, but it was over drug abuse issues, not sex.
So, it is possible for two HD'rs to go at it successfully, but it leaves less time for other endeavors :-) The other thing I learned was that mutual respect is paramount to success. It is a foul to get off at your partner's expense without mutual consent. That translates to not ignoring your partner during the act (no staring off into space).
There is my $.02 worth. -NOPkins-
I will ferret out an affair at any opportunity.
-An affair is the embodiment of entitlement, fueled by resentment and lack of respect. -An infidel will remain unreachable so long as their sense of entitlement exceeds their ability to reason.
