Yeah, "cuming" refers to orgasm. I think you mean female ejaculation or squirting.Simply put, most women do not ejaculate. This "squirting" phenomenon is shown in porn sometimes. Young boys are really intrigued by it. It's visually entertaining, and it makes sense to them. When they orgasm stuff comes out of them. They want a visual confirmation that a girl has orgasmed. Honestly, you don't need to worry about it. If your partner is going on about it, just tell him to shut up. He'll get over it. Or you can always get over him! jk lol
Anyway, if you want to orgasm during sex (something allot of us ladies have to learn how to do. Totally normal!) ...try talking to your partner about doing more foreplay for you. Also clitoral stimulation during sex can help allot. Having either your partner massage your pussy around your clit area, or just doing it yourself can really make a difference.