Richard Sprott, a developmental psychologist. For instance, some antidepressants , antihistamines, and even blood pressure medications can impair erections. Only you can measure what is normal for your sex drive. Well, the study also suggested that men thought about food and sleep more frequently than women. Some of the more interesting findings that led them to reach this conclusion are as follows However, testosterone, the hormone which primarily controls sexual drive in men, never stops being produced entirely. Most estimates put the mean number of orgasms as just under one per week, but some fellows just decide to give up altogether. Beyond aging, some reasons why libido may be affected for temporary periods of time at any point in the life cycle include stress, fatigue, preoccupation with work, side effects of medications, medical conditions, dissatisfaction with a relationship, and lack of desire for a partner, among others. The difference between these two studies suggests that cultural factors like social norms can have a big impact on the way that men and women seek out sexual relationships. These symptoms include a decrease in blood flow to the scrotum and penis; reduced tensing of the scrotal sac and delayed erection. The young women in the study reported an average of 10 thoughts about sex per day. While penile rigidity declines gradually beginning in most men at age 60, couples can compensate by experimenting with more creative and novel foreplay and stimulation as well as different coital positions. This includes thinking about sex. The researchers found that almost a third of these older men were sexually active at least once a year -- including about 1 in 10 men aged 90 to Cornell researchers surveyed 6, older men, half of whom complained of erection problems. Indeed, for many couples, a shared sense of humour, home and history far outweigh the desire for orgasmic gymnastics. Research from Alfred Kinsey onwards has shown that, on average, they have about three orgasms per week — but in some cases many more.