When drugs, alcohol and sex are mixed together in mindless, random, unequal amounts, the result is your 'pretty simple' becoming dangerously complex.<quoted text> Rape became a political football, when the religiopolitical right discovered it would need to except pregnancy via rape from abortion restrictions, in order to maintain a very large segment of their base - namely women.(Doesn't really matter to a lot of otherwise so-called 'pro-life' folks, that a fetus is a fetus is a fetus, as long as the votes are secured.)
Discussions about this often quickly descend into whether or not some rapes are inherently more 'rapey' than other ones, what constitutes 'consent', the benefits of state-mandated instrumental rape, and whether or not it's rape if a famous, or politically connected, or wealthy, or athletic, or clergy person does it. Currently, in certain circles, the discussion extends to whether or not a woman can even GET pregnant via a 'real rape', but most folks try to stay away from that particular question.
In my view, any non-consensual aspect of sex, and any unwelcome intrusion involving any orifice, can be defined as rape. Did you ask before you did whatever you did to the person? Did the person specifically say "Yes, I want you to do that."? If not, DON'T DO THAT. Pretty simple, really, and tends to avoid confusion.
And of course it doesn't always involve a penis. Men get raped too.
'Pretty Simple' is for kids.
From there, we learn to grow up. At least some of us do.