Sex life and spirituality. Is sex bad? (videos)
15 iskcon devotees answer this question.
Srila Prabhupada: If one uses the vibration of the holy name for the benefit of the material body, for material wealth and followers, or under the influence of greed or atheism – in other words, if one utters the holy name with offenses – such chanting will not produce the desired result very soon. Therefore one should diligently avoid offenses in chanting the holy name of the Lord. (Sri-Caitanya-caritamrta, Antya-lila, 3.60)