It's been a while since I reviewed a bisexual site, but from what I can remember, the quality is always high and often the girls aren't nearly as hot as the guys. But Why Not Bi feels incredibly fresh, not just because it's new, but also because they have high production values and attractive male, female and trans performers.
Another thing I've noticed on bi sites is often there's a third wheel in the MMF threesomes. Sometimes a guy is focusing almost exclusively on the girl, while other times the two men go at it with the woman sidelined. On WhyNotBi, though, the threesomes and foursomes feel more like all hands on deck (or dick or pussy)! You'll even see pegging and at least one versatile transwoman.
I also enjoyed their reality-themed porn scenes where the bi guy alternates between a male and female lover. For example, in one such scene, a guy fucks his girlfriend and her brother, but both encounters take place separately, so while it's not technically a bi threesome, the boyfriend happens to be bisexual.
The site is still new, so you'll only find 19 scenes right now, but they've been consistent with the weekly updates. You have several resolutions to choose from and you can stream in Full HD, but there's no option to download. The high-res pics can be saved, but only one at a time because there are no Zip files. You can check them out in an automatic slideshow, though.
Sorting and filtering options are available along with a basic search and tags. The scenes have "like" and "dislike" buttons, favorites and a "watch later" playlist. The model index gets a bit complicated, though, because it also displays the guys from across the eight Men.com gay sites. You can only access that network if you pay close to $30 a month to upgrade your membership. Otherwise, you don't get any bonuses.
Why Not Bi has some incredibly fun and raunchy bisexual scenes, but it's not very big. Still, they are growing with regular weekly updates and at the price they're asking, it's not going to cost you that much for a monthly membership. Or go with one of their trial offers that also have reasonably priced rebills.
Members Area Screenshots