If a guy is married likes pussy but sucks cock even just once I'd say he is 50% . So how do you quantify any other % ? Is the glass half empty or half full, is it partly sunny or partly cloudy ?
Just once? What if he doesn't like it? What if he only likes it a little? What if in his lifetime there are fewer than 5 men to whom he could find himself sexually attracted? What if he can't get turned on enough for same-sex play unless there is an attractive woman to watch or direct?
I don't call myself bisexual because with that particular label, people automatically assume the attraction is equal. For me, it is NOT. Even a very pretty woman with a body I like is less likely to stir up a sexual response in me than a man who is further away from my physical ideal. I would align my life with a man's, but no woman has ever tempted me into daydreams of making a family and growing old together. Another woman living in my house? GTFO. I hate living with women. Furthermore, most of the women I laid with were disappointing and unsatisfactory sexual partners for me. Then there's the fact that most of the women with whom I would like to have sexual contact find a way to turn me off before I can express my burgeoning interest. I've never been distracted by the fantasy or memory of sex with any particular woman, but a man can really get under my skin and spoil my focus. If I think fucking a guy might wreck our friendship, I'll want to discuss that concern, but I can be talked into sex anyway. If I think sex will spoil a friendship with a woman, sex is off-limits. If semen seeps into my panties after sexual contact, I'm turned on again automatically. The very idea of another woman's fluids in my underwear disgusts me. It just isn't anywhere near 50-50 attraction. If I could find a man who was just right for me, I could easily never lay hands on another woman, and not ever give it a second thought, as happens whenever I am monogamous. I have never thought any woman I got physical with could make me not want to ride a real penis on a regular basis. I can't even watch "lesbian" porn scenes because for me, sex without a penis is almost without a purpose, and so many of my same-sex interactions have been boring and tedious.
I do believe sexual orientation is fluid and spectral, but I can quantify mine. I call myself heteroflexible, because I'm mostly oriented toward sex and love with cis-male people, but have experienced significant attraction to trans-male and cis-female people as well. I have never been attracted to any trans-women. Most of the time I report as heterosexual if asked, to avoid confusion or hurting the feelings of a female acquaintance who wants to initiate adult situations with me. But my actual self-identifying label of choice is heteroflexible. I very strongly prefer dudes, but there are women I could hook up with casually.