Yes

You have it all worked out. When your wife gets home you'll give her a kiss and tell her to get ready for you, that you're just going to have a shower. Then, you'll take the viagra and come out of the shower when it takes effect. The first part goes ok, but it takes the viagra way longer than you thought. Your cock stiffens slightly, and you give it a couple of strokes but there's no improvement. You think of your wife lying in the bed outside and stroke harder. Finally, you slap it. "Come on" you whisper. You slap your cock again and it suddenly begins to swell, growing bigger and harder than it ever has. You give it a couple of test strokes. It almost hurts, it's so hard. You hear your wife speak from the bedroom.

"Babe, are you ok? What's the matter?"

You turn off the shower and quickly dry your hair. Your hard cock bobs and sways. You step out of the bathroom and into the bedroom.

"Nothing." you say, proudly displaying your erection. Your wife is lying on her side with her legs drawn up, but when she sees your stiff cock her eyes widen and she spreads her legs, revealing her dripping pussy.

"Then get over here and fuck me!"