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what you describe is the natural behavior of men, until the normative hetero "moral" infects your mind. Remember to be as much natural as you can, that will make you a happier man. And if you think I'm not qualified to advise you, read the scientific literature regarding human nature, though you would need to dig deeper in libraries or the net to find those titles, the straight culture is not happy about those findings. They fear they'd all enjoy a finger up their ass (as they know they do) and their neighbor would know that about them.
I was never attracted to my older brother, but he loved cock and women too. Like you I love its entertaining erotic properties.
I remember growing up on my reservation in New Mexico, during the summer of 1987. I was incredibly horny and the constant erection as well as my cousin who is actually gay. We didn't have air conditioning growing up and it was a hot night during a sleep over when he spent the night in my room at my house in the wee hours of the morning. I heard him get up from his sleeping bag on the floor to use the small closet restroom my brothers and I shared. He softly shook me awake and asked me if I wanted to look at his dad's stolen Penthouse and Hustler magazines. 
