Do you need sex to begin a relationship?

When I was little girl parents said you need marry at 30 then can have sex. However I am seeing all girls in 20s have boyfriend but have sex. Then I used to think you need date 1 year then have sex with boyfriend. Now any man I meet they want sex only & this is reason at 22 I still can’t have boyfriend. Like do u girls have sex first then you both enter the relationship date meet parents etc? Ik one guy 3 years we were friends then went on few dates and very close now we are meeting for sex. I never let him have sex in 3 years. However all men I met only wanted sex & gone. Then I see girls pregant or men dating girl daily so obsessed for her and I’m like why men drool for girl? Must be sex no? Then I hear girls have sex with guy then after they begin serious relationship. I’m comfortable to have sex with this guy as I love him but haven’t met parents hold hands had dinner date, been to his home celebrate all holidays that is only thing I want in relationship we don’t need meet weekly. But I feel u need have sex first then u both. Begin serious relationship?
Do you need sex to begin a relationship?
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