Ball licking
Ball licking refers to the oral stimulation of the testicles and scrotum with the tongue. The term is colloquial and used mainly in sexual or pornographic contexts. For some people this kind of touch is pleasurable or arousing, while for others it may be unpleasant or intrusive.
As with any intimate practice, it should only be done with clear consent and care. The scrotum is sensitive and can be easily irritated or injured; strong pressure, sharp teeth, or hurried movements should be avoided. Hygiene and clear communication about boundaries are important.