Just Wondering

I have read a lot of confessions on this sight pertaining to straight and or bi curious guys that love to suck other guys off. I have yet to try but every time my last girlfriend would blow me, she liked to come up with her mouth full of my cum and deposit it my mouth and we would share. Also whenever I emptied my balls in her pussy she loved it when I pulled out and then licked her to orgasm while tasting and swallowing my cum. Since we split up, I have watched a lot of gay and straight porn and am always very horny when I watch them blowing and swallowing nice, thick, creamy loads. What makes all you guys so fucking into sucking cock. Curious.