to this:
XXX: It seems that Lem had a story about nine-sex beings. They had serious problems with reproduction.
yyy: There were so many physiological holes that the guys were just confused where to hide? The nightmare yes.
XXX is worse. They could not have sex for pleasure until they had collected the full set.

Not with Lema, but with Clifford Саймак. Not nine but seven. The work "The Mirror" is called.
Long live the fantasy! and ;)