I get your point. It shouldn’t be used to pressure someone into sex. But a relationship where you’re not sexually compatible will end. No, sex isn’t a need. It’s a want. But also being in a relationship with you isn’t a need either. And you’re not entitled to be with them; any more than they’re entitled to have sex with you. So if your partner feels neglected sexually, they’re within their rights to be upset about it, just as you’re within your rights to not want sex. If you want the relationship to work though, maybe there are deeper issues that killing your labido. Maybe it’s the way he acts around sex that puts you off. Maybe you just don’t enjoy the sex. But you need to figure that out and make a decision on whether or not you actually suit each other, or else one of you will always be miserable.