I like to think of it as percentages
0 100% heterosexual (Arnold Schwarzenegger style xDD)
1 90% heterosexual, 10% homosexual
2 70% heterosexual, 30% homosexual
3 50% heterosexual and 50% homosexual; bisexual.
4 70% homosexual, 30% heterosexual
5 90% homosexual, 10% heterosexual
6 100% homosexual (Bruno xD)