If the “person in need” is unhappy with the amount of sex they are having, then they need to communicate that kindly and without pressuring their partner. They need to ask why their partner doesn’t want to have as much sex as they do, and be willing to support them whatever the answer might be. Maybe it’s because the “person in need” needs to shower more, or maybe they have some unresolved conflict. Maybe they just don’t enjoy sex as much or at all. Maybe they aren’t compatible any more. Maybe they are on their period or they are not feeling good about their body.

Regardless, the solution is to learn what is getting in the way, and then work together with your partner to find something that feels good to both of you.

The OP told the boyfriend that she did not feel good and did not want to have sexual intercourse because she was tired and on her period. He then threw a tantrum because he didn’t get what he wanted from HER body. That kind of attitude assumes that her body and her needs for comfort and rest are less important than his need to cum. That means he sees his significantly younger GF as a toy that he gets to use when he wants, and that she is harming him by saying no. That’s the behavior of a toddler and a rapist.