Significantly greater mean per subject percentages of successful intercourse attempts within approximately 15 minutes after dosing were observed for avanafil 100 mg ( mean 25.9 % , LS mean SE 24.7 % 2.9 % ) and 200 mg ( mean 29.1 % , LS mean 28.2 % 2.9 % ) vs placebo ( mean 14.9 % , LS mean 13.8 % 2.9 % , p = 0.001 and < 0.001 , respectively ) .