The largest group of people are 100% straight. There need be no "subcategory". If you are 100% straight, call it "straight" or heterosexual, and end it.
The next largest category of people are 100% gay. Again, if you are 100% gay, call it "gay" or homosexual, and again, end it.
If you are one of the 1.6% of people who identify as bisexual, use whatever further description best describes your particulars. Call it mostly gay, mostly heterosexual, half and half, 42.7% gay, pansexual, heteroflexible, etc. etc.
In your way of thinking, a guy says he's gay, and this perhaps means he has no interest in women, or maybe it means he's more into women than men...we don't know.