I know this thread is rather old, but I thought it might be benefited by a different perspective on this topic. Before I begin, I'll give you a little background about myself since I think it will be helpful in understanding where I'm coming from.
"The sexual continuum" (straight---bi---gay) is frankly inadequate in describing an individual's sexuality, since it reduces something of near infinite potential complexity to a simple set of percentages, but since I need to give you at least some kind of a hint here I will relent just this once and say that I'm male and around 95% straight. Sex with men is not something I entirely rule out, but a man's body and a masculine attitude almost never makes the sparks fly for me in general. A woman's on the other hand, well, in my case there appears to be no limit to the myriad ways in which a woman's physical and mental presence can excite my mind and body. Why am I mentioning this? Because it is important to understand that I *can* be turned on by men. It's very rare, but it's possible. Now, on to the main part of the post:
So, strap-ons and going Greek, and the homo/heteroerotic relative potential of both. Some say that going Greek suggests latent homoerotic tendencies in the male, then again many do not. At the same time, it seems that the vast majority of people regard a woman using a strap-on with a man as *definite* homosexuality on the man's part. I won't speak for how others feel but I could not disagree more for myself. The way I feel about a strap-on used by a woman is *totally* different than the way I feel about receiving anal sex from a man. The latter is homosexual in nature, obviously, and appeals to the very small part of my sexuality that is turned on by men. The turn-on is the masculinity of the individual with whom one is having sex and the expression, through his penis, of that sexuality and the shared experience that results. However, the assumption that a strap-on as used by a woman on a man *must* be merely a stand-in for an actual penis and that the recipient is, in his mind, imagining receiving a real penis, is not at all accurate in my case. In my mind, the strap-on is simply one more object that can be used by a woman as an expression of her own sexuality, a sexuality that I find far more attractive, personally, and one which is not in any way "masculinized" by the presence of an object that resembles something so obviously male. To reject it as specifically male-only in nature and assume homosexuality as a result diminishes sex by needlessly compartmentalizing it. In my view, hetero/homo/bi/etc. are practical terms that are ultimately meaningless. I get turned on by *people*, their personalities and the way those personalities are expressed in their bodies, how they use their bodies and the various items they may use to enhance the experience. Male, female, whatever - when it comes down to actually having sex, gender is not important, only that the person/people I am with stimulate me in a way that I enjoy (and vice-versa). A woman with a strap-on is, for me, no less womanly during its use and the turn-on for me is still to do with her *feminine* sexuality, in all the ways that it is capable of being expressed. When I am the recipient of a strap-on, what is going through my mind is the female sexiness of that individual. At no point do my thoughts drift to images of male penises, chiseled, male abs, or whatever, because none of those things are possessed by the person wearing the strap-on, obviously.
Now, if *you* (the general "you" - I'm not directing this at anyone in particular) regard such strap-on use as "gay" then that's fine: it might be that, were a strap-on to be used on you, the images and feelings going through your head would be homosexual in nature and if you don't get off on that then there's no problem there at all. However, I strongly recommend that you recognize that what you would feel in that situation should not be assumed to be what *everyone* feels in the same situation. The human animal is wondrous in its diversity of feeling and expression. There's no need to limit it by trying to diminish the very real feelings that others experience just because you personally could never imagine yourself feeling that way.
Anyway, if you've got this far, thanks for reading (this was my first post!) and I hope you can accept my viewpoint with respect, as I do yours.
Stay sexy and stay happy. 