You might ask - and this is most probably true if you are not sexually attracted to me, but also if you are, yet believe that acts of sexual intimacy should remain private - what reason I could possibly have to publicly share, for example (since I just did this), a picture of myself with a dildo in my ass. First and foremost, there is the issue that I am a model, and an erotic artist, and basically what I'm doing is what would be commonly referred to as "porn". You might not agree with porn, but I do, and it's something I enjoy being involved with. If, then, pornographic images of me, personally, are not your cup of tea, then you might simply avoid them, but that would at least explain why it is I do what I do.
But there's another side to it, and it's this. Through my erotic photography - and most specifically, my erotic self-portraiture - I am following the philosophy, as spoken by one Mahatma Ghandi, of "being the change you wish to see in the world", as well as practicing a variation of the Golden Rule, which I would phrase thusly: "do for others what you would have them do for you".
Unlike most consumers of pornography, I do not feel ashamed and do not express hypocritical views whereby I will enjoy my consumption of said pornography and then turn around and criticize it to maintain my social standing. And also unlike the majority of pornography consumers (strictly speaking statistically), I am, although not female, above a certain standard of attractiveness (at least by certain opinions), which makes me more viable than average to serve as a model in pornographic pictures (and videos).
So, here's the thing. As an extension of my sex-positive perspective, I am not ashamed or appalled by any person's public, sexual display (provided basic standards of where and when this occurs, so as to minimize the possibility of unnecessarily shocking prudes). In my vision of the ideal world, if I come to know or know of a person in the world that I am attracted to, I would love for the opportunity to see that person in sexually compromising positions. It may be true that I'm asking for a shortcut to wining and dining, but at the same time, I'm not asking to actually have sex with them - I'm just talking about pictures, here. So imagine, for example, I cross paths with a hottie on the street. It is my desire that I should have access to images of, for example, that same hottie naked, on all fours, with a dildo in her ass (or maybe not that specifically - that's just today's example).
Obviously (or maybe not so obviously), I don't want to force people to pose for pornographic images against their will, but I would be happier if there were less stigma so that more people would be in a position to volunteer (enthusiastically, even) this service. There would still be those who are not interested, but those who are would not be so easily talked out of it, and those who aren't sure would be more likely to give it fair consideration. And by doing it myself, I am showing what a good sport I am, and that I am not asking of others anything that I would not do myself. In the meantime, people who are attracted to me (and not uptight about pornography), can get the benefit of viewing my images. In this way, I am giving back to the community of porn-lovers, and not simply being a non-productive consumer.
Does that make sense to you? If not, it may be because you hold certain beliefs, alluded to above, about the privacy of sexual intimacy, and possibly the importance of its being couched within the context of a committed relationship. You are also, probably, not entirely familiar and/or enthusiastic about the practice of consensual voyeurism and exhibitionism (which I do not deny is an important element of the appeal of these impersonal, non-contact, porn-related activities). Which is fine. You're free to have those beliefs, and live your life accordingly. But I have different beliefs, and this is how I express them. :-)