There are lots of conversations here about people's level of health literacy and what they understand by particular terms.
The tweeter's handle is redacted.*
I am always surprised by people's level of knowledge of their bodies and what it means for contemporary discussions and hot topics. The fact that this man felt confident enough to mansplain what is otherwise a beginner's understanding of photosynthesis as a scientific gotcha in a discussion of rape is remarkable.
No, women cannot get pregnant with legs closed. If your legs are closed then your vagina isn't gonna get enough oxygen to optimally function. Besides, you also need light, which you aren't gonna get with your legs closed.
That's just basic science.
I frequently mention that the best available estimate of average adult literacy in the UK is that of a 12 yr-old, and the numeracy is that of a 9 year-old. Health literacy is taken to be somewhere between the two but in context depends on the level of numeracy involved (e.g., medicine dosages).
This is an extreme example but I think about this in the context of the need for clear language and very basic principles in health communication.
*NB: The tweeter's handle is found easily but that's not my main point although this was a conversation about rape. He intruded into the conversation and there is Twitter coverage from people indicating that he has a profile similar to that of incels. He has negligible followers and he doesn't need the oxygen (no pun intended).