shes very incorrect.
If the only way u can make ur man happy is by sucking his dikk/doing other sexual favors that tons of other women will do as well, then u lost.
plain & simple.
It's a general thing, believe it or not fellatio is a very important thing to most men. Takes shyt from "she digging me" to "she cares about me" when it comes to a serious relationship. Nothing like this beautiful woman who you want to spend x amount of time with willing giving you the mouth.

Not many things more beautiful and inspiring
BUT, lets end this men-bashing, self-loathing narrative that all men are filthy liars and cheats. There is a difference between "we talking" and "we are together". If a dude came at you straight from the chest and said relationships weren't going to happen and you caught feelings, that's on you. If he never gave you a title or a conversation about ya'll futures never happened and you caught feelings, that's on you. If ya'll WERE dating seriously and you were doing all the good things but not improving yourself, or letting yourself go, or jumping crazy on the stupid shyt, then that's on you.
Men don't just cheat because of opportunity, men cheat because most women do a lot of fukking talking and not enough communicating. I can tell you now most women OVERESTIMATE how much they know about they man. We ain't complex.
I have NEVER cheated on a woman in my life, but I can tell you that I have dated multiple women at the same time and they knew about it because i'm a fukking man and I don't tip-toe around nobody. If I feel the need to talk to someone else, i'll break up with the first one. But I can tell you not getting neck action has played a role in who I cut loose and who I didn't. A bigger role than most things.
If doing things for your man will still make him cheat then give up on relationships and families and love and compassion and passion and all that shyt. Because you sound bitter as hell and you don't need to destroy another future king with your dating inanities.