I feel you shouldn't need to beg for sex. That shouldn't be the way.

Tell him how it makes u feel. It's indeed not just about the sex. It's about how you feel loved and wanted when he is intimate with you.

Currently there sounds like there is some detachment in emotion on both ends, you need to reconnect for it to work. And both need to be willing to work on it.

Perhaps if you are open, maybe you would like to find out his fetish and copy some positions etc from porn... instead of fighting it and telling him its wrong, turn a negative into a positive. Could be win-win at the end of the day.

And I agree, go out, dress up etc and make yourself feel good. He will come running. Good luck!