When this study from the BMJ is very informative.
bmjopen.bmj.com/content/4/8/e004996
It's a study of young people's (of both sexes) attitudes to anal sex.
The women divide between those who like anal, those who are "meh" about it, and those who find it unpleasant and/or painful. But all three groups expect to come under pressure to have anal.
The men go into anal mostly expecting it is something that should be on offer, but that the women will not want to have it freely and will have to be emotionally coerced into doing it, and furthermore that they will not enjoy it/ may even find it painful. Yet they still think it's their right to demand it.
To me, this article (clear, clinical, detached) encapsulates in a nutshell what's wrong.
Most women find anal does nothing for them/is actually painful. On these grounds alone they should be free to say "I don't want this in our sex life". Yet instead they are being coerced into it by men who know that they will find it painful (which says pretty horrific things about the young men involved).
And rather than giving young women the option of saying "no, not for me", Teen Vogue is adding to the pressure on young women to allow themselves to be coerced into sex acts they don't want and won't enjoy (and may well know from past experience they won't enjoy).
This is the opposite of "sex positivity" in the literal meaning of the words, namely having the sex you want with the person you want to have it with, consensually and enthusiastically and enjoyably, with their equally enthusiastic consent. Instead it's "sex positivity" in its patriarchy supporting, back to front, Orwellian New Speak sense of "forcing women into whatever sex men want regardless of whether the women want it."