christian....im shocked...shocked I say at your lack of knowledge....as our only German representative I expect you to be uber organized & a source of all knowledge....both drugs still need stimulation to obtain erection...its not as if one pops a pill and an erection occurs unprompted....advantage of cialisis is that it seems to last longer...as in up to 3 days whereas viagra lasts a day or so...when im on either everything just feels a bit more plump and ready to go..makes me feel like im 16 again