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POPSNASA Needs to Take Space Sex Seriously The fact remains however, that we are naive of the effects of sex in space, let alone if it is even a pleasurable experience. The mechanics of "human docking procedures" (as described by tests carried out by the Russian space agency) are a lot more complicated when in zero gravity. There are also huge ethical questions hanging over possible pregnancies in space. Zero-G tests on rat embryos produced decreased skeletal and brain development, the effects on a human embryo will remain a mystery. The fact remains that NASA continues to cut back biological research in favor of future Moon missions, so much about human sexuality in space will remain a mystery.