During this premenopausal period, a woman's vaginal tissues may become thinner, drier and slower to lubricate. She may lose protective fatty tissue in the pubic area while gaining weight elsewhere. Once pleasurable, intercourse may now feel uncomfortable, even painful. Not understanding these natural physical changes, she may complain that her husband is being too rough and withdraw from sex. Her husband may mistakenly believe she has lost interest in him.
Men go through hormonal changes too.
Testosterone, which influences a mans sex drive, reaches its peak between 20 and 30 and gradually decreases thereafter. A French study of 1408 healthy men ages 20 to 60 showed up to a 25 percent decline in testosterone over four decades. Primarily as a result of reduced blood flow, a middle-aged mans erections are not as firm as when he was young. However, none of these changes should interfere with a full sex life. Indeed, experts say the changes themselves can actually enhance the relationship and make for better sex - if the couple discovers ways to capitalize on them.