It's probably HER main reason.
That is a pretty sexist comment to make, that the main reason or her only reason is because of her boyfriend, really, is she so simple minded and unable to think for herself that she is incapable of making her own decision on what she does with her life.
Add to the fact that at least as of a year ago the photos and videos were being taken by a friend, yes a guy friend, but still just a friend. Obviously not a professional as I have stated before they all had a very amateurish look and feel.
I feel lucky to have one of my most favorite Playmates ever, continuing with nude modeling, so many Playmates fade away after there Playboy time is done. I feel even luckier that she is continuing into the explicitness that she has, it is a real treat, and honestly in the end if she does decide at some point in the future to make the decision to do a guy I will probably be disappointed.
If all models did not do hardcore because of a boyfriend/husband then there would be a lot less guy/girl porn out there.