That's not an easy one. I figured I had an attraction to male bodies in my late teens/early 20s. Had a tall, muscular friend whom I had a huge crush on, he was really kind and gentle too, our friend group called him "papa bear". Of course he was the most straight man I knew, because we can't have nice things lol. I can't say it was clear as day from that alone either, I was in a straight relationship for most of my 20s and came to terms with stuff later on. My sexuality is still something I constantly question, hovering between shades of ace and demi homoromantic... With a tint of physical attraction here and there. It's complicated!