Not to dispute what your friend says they were told but I think it's more likely that they want to rule out pregnancies than that they are worried about affecti

Not to dispute what your friend says they were told but I think it's more likely that they want to rule out pregnancies than that they are worried about affecting fertility. Having a test subject sign up unknowingly pregnant or become pregnant during the trial is probably a massive insurance headache even if you have the test subject sign paperwork to reduce liability.