It comes again to dialogue, proper communication and being objective on why and how you want your sexual relationship to go.
Get to know your partner well enough not to rush things. You may have something great ongoing and you spoil it over night by being impatient.
Get to know each other's sexual story, their past pains and hurts before you want to go dipping your head down there when she is not ready.
Same case: I recently met a lady who almost died after getting into orgasm for her first time. Now she has developed a phobia for orgasm. Imagine being in a relationship with such a person without an open conversation, someone may die on your bed while you are sent to prison.
Long and short is to build on proper communication before going into taking off clothes.
Take time to know and understand each other. That's the only way.
Make proper proposals with your partners to stay off trouble. Plus, don't go to a party for a first time, and expect to be everyone's friend. Don't desire to eat all the food on the dinner table, you may end up with diarrhea and indigestion...
I have said my own, if you like rush it, you go spoil soup