Idha, bhikkhave, bhikkhu vesiyāgocaro vā hoti, vidhavāgocaro vā hoti, thullakumārikāgocaro vā hoti, paṇḍakagocaro vā hoti, bhikkhunīgocaro vā hoti.  It’s when a monk frequently collects alms from prostitutes, widows, voluptuous girls, eunuchs, or nuns.