As one of New York's top sex therapists, I've treated more than 3,000 couples and individuals over the past 30 years. And over those decades I've noticed a seismic shift in habits. The most pressing sexual issue of the 20th century was women lacking desire and turning down sex. The old 'Not tonight, dear, I have a headache' idea. But now, things have changed completely. The most common dilemma for couples in long-term relationships today is men going missing in the bedroom. Perhaps HRT has...

As one of New York's top sex therapists, I've treated more than 3,000 couples and individuals over the past 30 years. And over those decades I've noticed a seismic shift in habits. The most pressing sexual issue of the 20th century was women lacking desire and turning down sex. The old 'Not tonight, dear, I have a headache' idea. But now, things have changed completely. The most common dilemma for couples in long-term relationships today is men going missing in the bedroom. Perhaps HRT has...