I don't know if anyone can answer that question - some sex researchers say all people fall somewhere on a spectrum of behaviors, where some are 100$ Heterosexual to the opposite extreme of 100% attraction to same sex only & others would fall somewhere between the two extremes. Obviously someone right in the middle would qualify was as Bisexual. Only you can answer what % of the time you're attracted to the opposite sex & what % to the same sex. You might do a little on-line research - there may be sexual questionnaires designed to reveal where you fall on the spectrum. There might be T-F questions such as "Sometimes I find myself attracted to someone of the same sex", or "I have never had thoughts of sex with someone of the same gender", etc. I've read that some people who claim to be 100% 'straight' have had dreams where they're either engaging in sex or attracted to someone of the same sex & that such dreams wouldn't necessarily mean you're gay or bi, but I don't know if there've been any studies that verified this. Also, some people may not feel comfortable admitting they have any same-sex attractions so they may vigorously deny homosexual desires, even though there may be evidence there's something there. So this is an area where a lot of Psychological research probably still has a long way to go in determining a person's true sexual identity.