Ohhh, the everlasting thread!
There's a thread on exactly that article in the feminism boards if I am not much mistaken. Certainly about the PIV= rape topic.
You should read the whole blog for context. This kind of statement is often taken out of context, and used to create drama.
Take for example this sentence: " intercourse is inherently harmful to women and intentionally so, because it causes pregnancy in women"
That's true. Intercourse is not in women's best interest if they don't want to be pregnant, and I don't know about you, but most of my life I don't want to be pregnant. Like, nine months out of my whole life would be enough forever.
The blogger is very emotional about this, but at the core, it's true. You may still choose to engage in intercourse, but the fact remains that it has its risks.
If you take the title of that post out of context, you won't understand it.
It's like the "all sex is rape in patriarchy" statement - the idea is that there is no real consent in a rape culture as you have all those factors pushing you towards saying "yes" to intercourse, so that in the end, it is in many cases not possible to determine whether you would have said "yes" in an environment devoid of all these factors.
(Obviously there is lust on first sight, but other than that ... I know so many girls who got into their first relationship with a man because they thought they needed a boyfriend ... any boyfriend.)