'Worthless man, [sexual intercourse] is unseemly, out of line, unsuitable, and unworthy of a contemplative; improper and not to be done... Haven't I taught the Dhamma in many ways for the sake of dispassion and not for passion; for unfettering and not for fettering; for freedom from clinging and not for clinging? Yet here, while I have taught the Dhamma for dispassion, you set your heart on passion; while I have taught the Dhamma for unfettering, you set your heart on being fettered; while I have taught the Dhamma for freedom from clinging, you set your heart on clinging.
"'Worthless man, haven't I taught the Dhamma in many ways for the fading of passion, the sobering of intoxication, the subduing of thirst, the destruction of attachment, the severing of the round, the ending of craving, dispassion, cessation, unbinding? Haven't I in many ways advocated abandoning sensual pleasures, comprehending sensual perceptions, subduing sensual thirst, destroying sensual thoughts, calming sensual fevers? Worthless man, it would be better that your penis be stuck into the mouth of a poisonous snake than into a woman's vagina. It would be better that your penis be stuck into the mouth of a black viper than into a woman's vagina. It would be better that your penis be stuck into a pit of burning embers, blazing and glowing, than into a woman's vagina. Why is that? For that reason you would undergo death or death-like suffering, but you would not on that account, at the break-up of the body, after death, fall into deprivation, the bad destination, the abyss, hell...
"'Worthless man, this neither inspires faith in the faithless nor increases the faithful. Rather, it inspires lack of faith in the faithless and wavering in some of the faithful.'"