By posing professionally, your girlfriend may legitimately have felt distanced from her sexuality in a way that pretend posing with you as part of a real sexual and romantic relationship may make her uncomfortable. There are people who are incredibly outgoing in real life and extremely shy in the bedroom and likewise, folks who are extremely shy in the real world, but voracious when it comes to a sexual relationship.
My advice is not to press her on this one issue, but instead, get to know her more, and see if there are other fantasy areas that intrigue you that aren’t necessarily offensive or uncomfortable for her.
I hope that helps — let me know how things go. And don’t forget to join me on AskApril.com on Facebook. I’d love to see you there. Here’s the link: [url][/url].