I know, don't blame the writing blah blah blah, but it's really hard for me to even care about this sex tape or fault Brooke for not telling people when they made it so incredibly obvious it was decided in season 4, not 1. It seemed so horribly thrown together, like they didn't even make an effort at all. Atleast with LP flashbacks they threw a wig on Peyton. The sex tape looked like Brooke and Nathan just went upstairs at that same party, filmed it, and then came downstairs and threw the tape in.
Also, there's no way Brooke could have entirely forgot it happened, maybe details, but not all of it. Something would have been mentioned in the previous 3 and a half seasons leading up to it, especially with the BLP drama.
So all that combined, it was so obvious it was a relatively last minute add in that had a clear purpose that I just don't care or really include it in anything.