I faced such a quandry ages ago. I had a spectacularly-breasted cousin who was four years younger than I and went to school near my hometown. It helped that she had a reputation as a slut (Inside the large, rather dysfunctional family, she was referred to as "boy crazy".) I was totally intimidated by the whole situation, but we got to be friends. Finally, when I was 19 and had recently gotten rid of my virginity, she and I were having one of those "life is unfair" conversations that teenagers have, and I was complaining that girls could get laid if they wanted to, but for guys it was harder. She disagreed. On the spot she called up a friend of hers and asked if she wanted to go to a drive-in movie with a "college man". She gave me a name and an address. An hour later I picked up the friend, a rather plain-looking young lady who had what I would guess were D-cup boobs but didn't wear a bra and who spent most of the night introducing me to oral sex. I was grateful.
It was years later that it dawned on me: Who would be more likely to be friends with the local big-boobed slutty girls than a big-boobed slutty girl? It's been decades since I've been in touch, but I am still grateful.