Me and my wife have been sexting off and on all day and i've been (in the mood) all day but when i try topreform my penis will not get hard, why?

Erectile dysfunction: Performance anxiety is a common cause of erectile dysfunction. If you are in good health and your wife understands the situation, you should just relax and erections will happen. If you have erections at other times, it points out that there is nothing wrong with your sexual apparatus. Otherwise, see a urologist for evaluation.