Here is my OWN opinion as to what can happen in different marriages:
Both spouses are LD, have little sex, and are very happy.
Both spouses are HD, have lots of sex, and are very happy (This in effect is the PERFECT MARRIAGE).
The Husband has LD and the wife has HD. This marriage will probably be in trouble, but I think that many women in this situation can tolerate the situation because many of their other needs are met, and I have yet to actually meet a women (even a HD woman) that has a sex drive that is even close to a below average sex drive on a man. Ask yourself, how many women want to have sex EVERYDAY like the average man does.
A LD women marrying a HD man. This is THE WORST POSSIBLE MARRIAGE. Most men I know are in this situation. Of all of my buddies, only 1 man I know actually has an acceptable sex life by male standards. When men get together and happen to talk about sex, only the real young guys still have positive thoughts about their love lives, while the rest of the guys think about what once was. Most men I know are actually only still married because they are honoring there commitment, and they are afraid of NOT being married. For this kind of marriage, unmet sexual needs make it impossible to have a decent marriage. Where as women have tend to have needs in addition to sex, if you look at the top 3 needs for men, they are basically ALL ABOUT sex. So if you ask a man in this kind of marriage how happy he is with this kind of marriage, make sure you ask him alone, and then you will get the TRUE answer.