Nikki's a tease. That's her thing. Get over it, all of you.
For one thing, she has been, and continues to be, extremely successful doing it, so if you're going to continue to complain, you might as well prepare yourselves (for like, the 999th time) for disappointment. Don't get me wrong, I'd like to see her do all kinds of stuff, but I have no right to complain about it just because it's something I would like to see. I wouldn't mind fucking her either, but I'm pretty sure that's not going to happen.
Besides, if you've seen much of her stuff over the years then you know she shows plenty, just not the full-frontal shots you're hoping for. She shows her nipples all the time, cameltoe, ass, etc. She shows as much as she wants to, and she's not going to show more unless she chooses to. And if you think some kind of boycott is going to change that, you're nuts. Batshit crazy. Even if such a boycott could be organized, I sincerely doubt she would cave from the pressure. I think it's more likely she would just call it quits.
Membership fees or not, she doesn't owe you anything. Unless she makes a choice to go farther, the only other choice anyone has in this situation is the choice we have not to look at her stuff.