I've stayed away because this thread, as many, descended into pps portraying or reading posts as something entirely different and assigning values to purely biological observations.
I'm a biologist and will talk about biology aspects, which is very different from making moral values.
People will get sexual pleasure in a number of different ways. We all know that. I don't have a problem with that. I get and give sexual pleasure in different ways.
Sex can mean lots of things, though.
Biologically, it evolved as penis into vagina. (Nothing to do with the patriarchy...) Those are the two organs that were shaped by natural evolution and natural selection to come together for reproduction. That is the "natural" way for sex because it was adapted for reproduction.
It's not a case of God created sex as PIV and anything else is unnatural.
In evolution terms, humans have escaped nature, including in sex. We don't use sex for reproduction alone.
So, we get sexual pleasure in many different ways that don't necessarily involve PIV. Fine.
However, some practices we use involve organs that didn't evolve for that purpose. Some organs are more adaptable (mouth, tongue and fingers- nobody mentioned these two) but other organs can be trickier (anus).
It's entirely up to the people (or single person...) involved what to use and how. And people should be fully aware of how best to use some of these organs and the risks involved.
For example, men have been coming out with HPV cancers in the oral region because they think they don't need condoms orally, all else being fine.
This takes me to the specific issue, which was mentioned earlier in the thread, of girls having anal sex to prevent pregnancy.
This is a very specific issue, and that doesn't apply to gay men or even lesbian couples. Sigh.
So, is anal sex a good option when women want to avoid pregnancy?
Yes, if that's your only concern. Maybe not if because you're doing analysis you're not using condoms. So, we'd be comparing protected vaginal sex vs unprotected anal sex. That's realistic in a society that bans condoms and in those occasions when they don't have them.
In that sense, girls (read above why girls) should be aware that such unprotected anal sex carries a higher risk of STDS than vaginal sex (I gave link earlier, it's not outdated opinion). Plus, because we're talking about avoiding pregnancy, it will involve penis (sigh- also read above), which can be wide, and eventually the pressure in the anus (which, let's remember, didn't evolve with penises in mind) can cause some damage to it (disclaimer - obviously the size issue will also apply if inserting large objects in the anus).
Sexual education of boys and girls (and it seems many adults) should involve all these aspects, so that they can make truly informed choices when deciding how to have sex.
Now, if you want to fucking select copy and call my post homophobic or sexually repressed, go ahead.