For me, and I hate to sound like a Nelson Montana broken record
, but Unleashed probably gives me the best libido boost of any test booster I have tried. DAA seems to really improve work outs, but not the libido nearly as much.
Liquid C, on the other hand, blows away any natural T booster as far as performance in the sack. But something like Unleashed has the advantage of increasing orgasm intensity which is nice, while the C lets you bang away with confidence.
Now, for the psycho analysis;
Your woman is super hot and horny, and she has you a bit intimidated. You are having performance problems because you are feeling like you need to perform for her, instead of what you really want, which is to have a hot woman for your pleasure and needs, without the pressure.
Next time you fuck her, look at her as a piece of meat, for your pleasure. Tell her what you want, and what you are going to do. Don't make it a negotiation. Then to top it all off, do something to show your dominance, like come on her face, pull her hair, spank her ass or something.
She'll appreciate that you manned up, and you will have a great time.
A lot of guys have the problem of thinking only of themselves during sex, but it sounds like you have the opposite problem, which can definitely lead to performance issues. Take charge and use her like you want to!