"In traditional Tibetan society" sexual abuse of young boys and 'monks' was "was condoned and rationalized as pleasurable release of little significance".

 From Tashi Tsering's autobiography, Struggle For Modern Tibet, co-authored with the renowned scholar and Tibetologist, Melvyn Goldstein:

https://books.google.com/books?id=_FA4DwAAQBAJ&pg=PA510&lpg=PA510&dq=intercrural%20sex%20tibetans&source=bl&ots=--Vbcf2RiG&sig=ACfU3U1JW_Dryy48Nyz8MA7H6VrwjsTDZg&hl=en&sa=X&ved=2ahUKEwiy2LHMqNH4AhUTEGIAHT7ZAzcQ6AF6BAgXEAM&fbclid=IwAR0xdpKgIRMe065Kt9-RdRBmyIlDTptlfUL7ES7flZ3jvPCUtHD__8xpr2I#v=onepage&q=intercrural%20sex%20tibetans&f=false

[Scroll down to the footnote numbered 1303] "In traditional Tibetan society", Tashi Tsering states, "it become common for monks and monk officials to satisfy themselves sexually with men or boys by performing the sex act without penetrating an orifice. They used a version of the 'missionary position' in which the monk official (the active male roleplayer) moved his penis between the crossed thighs of a partner beneath him. Since no monastic rule was technically violated, this behavior was condoned and rationalized as pleasurable release of little significance."