Orgasms are SO important
If you have good sex (i.e. sex with climax) you'll want to have sex more often. A Kinsey study shows over 80% positivity towards sex within the week of sex with orgasm, vs only 28% positivity towards the act if the sex was without. Meaning that you'll want to have sex within a week 80% of the time after good sex, but will only want sex 28% of the time after sex without climax. So it is in your partner's best interest to make sure you come!
It's so difficult to ask for what you want; but although it may feel weird and demanding and selfish, in the end, the result will be better sex which leads to more sex, which isn't any of those things.