Fem half of couple here..... We have experimented with Viagra and Levitra. Hubby had bad side effects with V. Horrible headaches, heartburn etc. When he tried Levitra, it was AMAZING. LOL, he was hard for hours, and then for several days thereafter, the wind blowing would make him hard. We have only tried the Levitra once, so it may have been a fluke, but we enjoyed it immensely.
While hubby doesn't have ED, he does on rare occasions have difficulty, so the occasional pill is nice to have.