i struggle over this a lot, and i do say struggle. i don't know where nature and social forces and other things start and end on this issue.
i used to be a pure closet case. my interests and lack of interests used to make people think i was gay, but now about half of people can tell just from the way i carry myself, dress, and my mannerisms. (although i think my going to a jesuit university throws a wrench in this. because i'm different in general, i think they just assume gay, even though they'd do the same to someone who acted different but was straight.)
anyway: i wouldn't answer the above questions because i don't know if i'm masculine or effeminate. i like to think i'm just kind of free of either. i take what i like and encorporate it into my personality. i find that in role-models and possible lovies, i'm attracted to people who work what they do. i model myself after a lot of my professors, especially the ones that seem in-sync with themselves. i can think of both male and female professors that do this, and i emulate all of them in some way. as for people i'm attracted to, they tend to be masculine, but i think that's because i don't discriminate between gay and straight, and there just happen to be more straight guys than gays, and more straights tend to act (i think whether they want to or not) masculine. i have, however, in the past seen certain effeminate gays that i wanted to get with just because they way they carried themselves seemed natural to them. there are many effeminate gays, however, that i feel the opposite way with (and super masculine guys), where it seems like a show.
i think if i say anything more i'll just start repeating myself.