I bet he's basting in that leather outfit under the hot lights. The little blue pill, Viagra, is a phosphodiesterase inhibitor so cyclic nucleotides go up (cAMP, cGMP) which activates cyclic nucleotide dependent kinases that phosphorylate Hsp 20 (I helped identify) and inhibits smooth muscle contraction-so tissues become engorged. It's interesting that even with a potent contractile agonist and myosin light chains phosphorylated such normally smooth muscle is contracted the smooth muscle relaxes=even cell permeable mimetic peptides will relax it. The exact mechanisms is not fully understood but appears to influence actin more so than myosin. Sorry I couldn't help myself-old habits "hard" to break. LOL.