A man can experience erectile dysfunction (ED) when his PDE-5 enzymes, which are meant to subdue erections after sexual climax, take action during the earliest stages of arousal and prevent blood from flowing the penis thus rendering him i…

For men, a healthy sex life and sexual relationships depends in part on the ability to adequately get and keep an erection long enough for satisfactory intercourse. John (not his real name), a UK man over 40 years old, suffered from erecti…