I've read that article, and many more. At the end of the day they have similar conclusions:
These data are limited in the sense that only self-reported same-sex attraction was assessed. Indeed, not all adolescents who have such attraction are willing to admit it. In addition, same-sex attraction is not necessarily the same thing as same-sex behavior or holding a gay/lesbian/bisexual identity. Sexual orientation is something that can be measured in different ways, and different forms of measurement can yield different results.
Overall, these results suggest that the sexual and romantic attitudes and behaviors of adolescents are related within social networks; however, desire for a same-sex partner does not appear to spread within such networks. In other words, same-sex attraction would not appear to be “contagious” among adolescents.
What are the similarities? - At the time of the study, the survey relies on the honesty of the child (but not all will admit the truth, as per the quote) - There's a direct connection between social circles and sexual experience - Results vary depending on the definition of the words (for example, another article on their page states that bisexuality IS defined as a sexual attraction towards both sexes, but here it doesn't) - Doubt all over the place, with words like "results suggest", "does not appear", etc. It's not exact.
I get it that you're adamant on wanting to believe something, but try searching for data that goes against your belief. There's a reason why more kids identify as non-binary or transgender today, and it's societies fault. Sexual behavior is directly related to the environment of the child, which also includes the likelihood of experiencing homosexual acts, peer pressure to be different (heard a girl on the bus say it was cool to be non-binary, and that all the girls in a slumber party kissed each other to try it out), and the adult content they're exposed to.
Regarding the vaginal and anal sex being the same... we obviously know that one of them doesn't lubricate, can cause additional infections/complications, and has cases where the sphincter muscles has loosen (and even torn). Can you guess which one it is? Put your bias down and think about it.
You asked for data earlier, telling me I don't have it. I assumed that you were educated, but I've realized that your sources are biased, so I'll provide it for you: