Personally, she probably was good at whatever she wanted to be good at. Men and women in my experience view sex differently. Men are more visual/hearing oriented and women are more emotionally based. She is not emotional about any of the sex, especially on the tape. Total faker. But, its something HE liked, she thought, so she was able to fake it enough.
Its not her first rodeo. I will agree wholeheartedly with others that JA probably was at some time supplementing her income over the internet or phone.
As for DB, for me personally, he seemed like a guy who at one time or still does had a good relationship with JA that included good sex. And honestly, on his part. Not so much hers. I got the impression from the way he acted while testifying that he was coming off a divorce, his child was his number one priority. That JA knew he wasn't marriage material anytime soon. He just probably gave her the impression 'someday' it might happen. She decided it was taking too long and moved on to TA. A chance encounter. JA only had 1/2 of the dream and wanted the whole shooting match. I know after my divorce it took me 9 years to get married again. I seriously did not want the hassle of putting my kids through another divorce so I waited, even though I was living and in a committed relationship, for 8 of those years. Skewed logic now, but back then made perfect sense.
DB ended up being collateral damage in her scheme. She used him just like everyone else to meet her needs.
Kelly