Repeated viewing of porn or even just associated masturbation can cause over-stimulation of dopamine, the neurotransmitter that triggers sexual pleasure. If this happens over and over, it becomes harder for the brain to respond. This can be reversed by avoiding pornography and sticking to a healthier masturbating pattern. It might sound easy, but men often have a hard time self-regulating this behavior, which is why often people seek professional help.
If you’re in a rough patch with your partner, it might be the culprit, lessening sex drive even in men who once had a healthy one, as a form of self-protection. If you sense a wall, identify what’s bothering you and talk to your partner about it, or seek professional help. You do have to address the issues, though. Avoiding the conversation might make your partner feel rejected or even suspect you’re being unfaithful.
Since sleep deprivation and exhaustion negate sexual interest, new moms and dads often experience a hit to their sex drive. And while fathers are spared from physiological changes other than being busy, sleep deprived and anxious, a woman has significant hormonal volatility post-delivery and breastfeeding will increase the level of prolactin, the hormone that stimulates milk production and lowers sex drive. Plus, baby weight often makes new-moms uncomfortable with their new bodies, adding another barrier to intimacy.