Yōga Sūtra 2.40

शौचात्स्वाङ्गजुगुप्सा परैरसंसर्गः।

śaucātsvāṅgajugupsā parairasaṁsargaḥ।

[शौचात् स्व अङ्ग जुगुप्सा परैः असंसर्गः।
śaucāt = by practice of cleanliness; sva aṅga = of one's own body parts; jugupsā = aversion to; paraiḥ = with others; asaṁsargaḥ = contact or intercourse;]

By the practice of cleanliness of one's own body parts, one develops aversion to contact or intercourse with others.