Some of you may ask your sex partner about the whether the hardness of penis will affect the quality of love making. Girls can feel the difference, you know? If your penis is hard enough to penetrate but not hard enough to give her the excitement, they may not be able to have orgasm. Your penis may not be hard enough to touch her g spot or the the penis is too soft to make her fill 'full'. You may have a big penis, but under the work pressure, resting issues, health problem or just maybe you are a bit distracted during the sex intercourse then it may affect your penis hardness thus your sex partner may not have the feel for orgasm.
How to overcome? It's nonetheless get enough sleep, exercise, take care of the food you take everyday and so on. And there are lots of products to help you out, like Libidus, Maxidus, Activ-Homme and so on.