Originally Posted by SexyKitty
Cialis and all other PDE5 inhibitors (Viagra and Levitra) ONLY WORK IN THE PRESENCE OF SEXUAL STIMULATION.
That of course could mean something different for everyone. If you are a normal functioning male with no erectile dysfunction then sexual stimulation could mean something as simple as brushing up against something that accidently touches your wang.
Differences bw Cialis and Viagra is you have a longer duration of action with Cialis (36 hours) vs Viagra (4-6 hours) so basically your getting more bang for you buck - no pun intended. This does not mean you have an erection for 36 hours, it just means you have the potential to get one during that time. Mass - maybe your just real horny. You can also eat when you take Cialis, eating will inhibit the effectiveness and duration of action of Viagra.
Hope this helps
SK