PIE words for sexual organs

[Michael]

Dear IEists!

	I was told that Walter Wuest had an article on IE words
	denoting sexual organs, but i couldn't find. Could anyone
	give a reference? I myself have not infrequently been puzzled,
	that all three PIE words, which can be reconstructed for 'vulva',
	have at the same time the meaning 'buttocks, anus' (namely,
	*putos, *ksutos and *pisdeH2). Any suggestions? [  :-)  ].

		Regards,
			Mike