I have worked in the field of sexual health for almost 20 years and had never previously heard about an increased risk to women due to anatomical difference- interesting and I will do more research, as it is possible a lot of educational resources need to be updated.
We seen no end of damage, to both men and women, upon whom anal sex has been forced, and/or who have consensually engaged in anal sex without adequate knowledge of how to do it safely.
Equally we see younger and younger girls and boys wanting to try it and believing it is standard sexual practice- so the messages we try to drive home are around safely, consent, choice, and we talk a lot about the impact of porn on expectations and norms.
One of the key messages I would give to parents is that young people often watch porn for education; yes they do at times enjoy it, but they often want to know how to do things, what sex is, what their bodies should look like, how to please their partner, etc. so rather than all of this pearl clutching around "oh my god anal", I'd say the best thing you can do is try and counteract the shite they see on porn with real, up-to-date knowledge and information. It's critical from a much younger age than you would expect. The porn industry sadly isn't going anywhere and so we as parents (and in my case as an SRH expert) we need to intervene regularly, early, and responsibly.