No - I do not think just because a woman can see that another woman is sexy or that she has a "nice pair of breast" or a "firm butt" means that she is gay or bi...... I for one can see when another female has been blessed in her creation and I am neither gay nor bi - and I do know what sexy looks like in both a male and a female (heck, who couldn't - we see it every where we look these days).

... and - IMO - I feel some females notice another's females breast (how perky firm and north they are) for we often wish we were still like that after turning 30 or 40 and breast feeding all the kids.
Its All Good....