Their release frequently accompanies that of melatonin, the primary hormone that regulates our body clocks. Hormonal Balances Finally, you two both are likely experiencing shifts in your hormones. Weak pubococcygeus PC muscles can impact the strength of orgasm — another reason Kegel exercises are important. Make sure your sex toys are designed for the purpose for which you plan to use them, and always clean them with mild soap and warm water or a cleaner made specifically for sex toys. But that only works if the libidos of the two spouses or partners are similar. The release of these brain chemicals during orgasm heightens feelings of bonding and trust between sexual partners, which may partially explain the link between sex and emotional attachment. Orgasms are not an innate ability. For many women, the correlation between sex and snoring is one of those annoying facts of life: A recent survey of 10, English men revealed that 48 percent actually fall asleep during sex. What about the evolutionary reasons for post-sex sleepiness? But perhaps since he cannot immediately run off with another woman anyway—damn that recovery time! For unknown reasons, intercourse orgasms release four times more prolactin than masturbatory orgasms , according to a recent study. Nutritional needs change with age, too, and it may be that dietary modifications, as suggested by a registered dietician, will be helpful. Dave Zinczenko, the author of "Men, Love and Sex: Cardio exercise will beat weightlifting here! But perhaps since he cannot immediately run off with another woman anyway — damn that recovery time! If so, your healthcare provider or a physical therapist may be able to help guide you and your wife toward a fitness program that helps you both to feel more energetic and able to be sexual in ways that you desire, without feeling overly tired.