Velofel The body releases serotonin, which supports feelings of well-being and happiness, during the arousal phase. Norepinephrine dilates and constricts blood vessels, making the genitals more sensitive. The body releases this during sexual stimulation. Reasons that sex might not feel good Sex is not pleasurable for everyone. In fact, some people feel pain during sex. This is much more prevalent in females. Around 75% of females report experiencing pain during sex at some point during their lives. Around 10–20% females in the United States experience regular sexual pain, or dyspareunia. Some common reasons for sexual pain in females include: vulvodynia, a chronic condition that causes itching, as well as burning pain during and after sex vaginal infections such as yeast infections muscle injuries or dysfunction, especially pelvic floor injuries after childbirth hormonal changes, which may cause vaginal dryness and pain Males can also experience pain during sex. Some common causes include: structural abnormalities in the penis, such as phimosis infections problems with the prostate, such as prostatitis.