Though I completely agree with your position on the definition of rape, he was merely stating that very definition as it stands from a legal perspective. In most countries, the US included, "envelopment" is not considered "rape". Rape is defined in the US as "the forcible penetration of a penis, appendage (finger or fingers, hands, feet) or other object into an orifice (mouth, ass, vagina) without consent, through restraint, coercion, violence or the use of intoxicating substances. Envelopment is only considered sexual assault, but not rape. Shitty, huh? I also think that that idea is utter lunacy. It's not exactly admirable for the uke to manipulate the law and the loophole like that, especially to blackmail someone, but women have been known to do exactly the same thing. Coming from either side (male or female), it's shitty, underhanded behaviour. You can thank NOW (National Organization for Women) for that lovely little loophole. NOW has fought for decades to prevent the definition from being changed. It's a power play for feminists. With the definition as it stands, a woman can only be a victim of rape, not the perpetrator. Unless, of course, she literally sticks her foot up a guys ass. Even then, there would be a question as to whether it was rape, since she likely would not orgasm while doing it. Feminists like to claim that there is no equality and they are right. Women have way more rights and privileges than men do. Ever heard of the "Violence Against Men Act"? No? That's because there isn't one, but there is a "Violence Against Women Act". You should Google it and read the entire act. It will shock your socks off at how men are portrayed as the only perpetrators of domestic abuse. Victims are always referred to as "she" and the perpetrator is always referred to as "he". I guess NOW believes women in domestic partnerships are incapable of violence. NOW basically wrote and spearheaded the campaign to get VAWA accepted and passed into law. VAWA was also the catalyst for how rape is defined around the world. It would be perfect if rape was defined as "any sexual act performed without consent", but NOW has fought that definition for decades because women could then be a perpetrator as well as a victim. Feminists have an agenda and it isn't always the one they claim it is.
I don't agree with what the uke was implying here http://www.mangago.zone/read-manga/hishoshitsu_no_himitsu/mf/v01/c005.1/19/
I'm sure that men do get raped by women too. They aren't penetrated, but they are forced to perform sexual acts against their will, used and taken advantage of, which is what i thought rape was. So i think that what the uke was saying, is wrong.