The big problem with modern heterosexual relationships is that apart from the sex, there's really not much in it for men any more. Men have few legal rights over their own progeny; family law for decades has whittled away a man's parental rights to little more than a financial obligation. If the woman already has children from a previous marriage, the man incurs an enormous burden in return for very little gain: in most cases he has no parental rights over the children, he competes for his wife's time with the ex (and the ex's family), and he incurs huge financial burdens but gains very little actual power in the household. A man's sexual life is viewed with suspicion and sometimes disgust by women, who seem to want to train a man's sex drive in the same way they train a naughty dog. A man alone with a small child is a man always on the verge of being accused as a child molester or abuser -- society has made single men afraid to even approach children who are not their own (and sometimes even when the children are their own).
Commentary on popular culture and society, from a (mostly) psychological perspective
"A man's sexual life is viewed with suspicion and sometimes disgust by women,..."
Monty over at Ace of Spade's blog discusses Hymowitz's book Manning Up: How the Rise of Women Has Turned Men into Boys: