Hi: hubby developed male menopause about 3 years ago ( yes it exists) and has actually tried all three of the current medications on the market: viagra, levitra and the new one Cialis (the weekender).
He has experienced similar results from the viagra as other respondents have listed. He now has been using cialis only as needed (doesn't need it all the time as it's dependent on his testosterone levels which he uses androgel for). but Cialis is by far the best drug. Can be taken Friday( or anyday ) on a full or empty stomach and provides him with the ability to be spontaneous any time during the weekend. He is able to acheive and maintain multiple erections and multiple orgasms as he did in his 20's,30's and 40's!
the nice thing for me (the mrs) and the women we have played with is that there are no side effects ( no runny nose, no flushing, no headache ) and it allows us to be intimate in a more natural way as the half life is longer than viagra so it doesn't wear off after 4-6 hours!
Hope this helps !