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Observations:

Aliens usually choose human males to be “hosts” of their young.

Very complex relationship between humans and aliens (are they slaves? Are they mates?)

Sterile eggs are intoxicants (as well as alien stingers)

Gan chooses to honor bond between the species and chooses to accept the risk involved with impregnation

Interpretation:

Although Butler does not intend to write a story of slavery, the “pregnant man” story exposes gender issues of inequality and subjugation.