I don’t like sex and never really have. I’ve had plenty of it over the years, but have faked my enthusiasm. I can reach orgasm, but it’s a flutter, rather than an ecstatic peak. I’ve been with my husband for 12 years and we have two children, but I feel tense every time he makes love to me and can’t wait until it’s over. I haven’t told him how disengaged I feel, as I’m worried he’ll leave. What should I do?