<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> It can be confusing when erections work normally in some situations but become difficult in others. For example, some men may have normal morning erections or erections during masturbation but struggle during sex. One possible reason is performance anxiety. Stress, worrying about maintaining an erection, relationship concerns, or a previous difficult experience can make it harder to stay relaxed and aroused with a partner. Lack of sleep, tiredness, alcohol, and other lifestyle factors may also affect sexual performance. Having erections in certain situations does not completely rule out physical factors. If the problem happens repeatedly, a healthcare professional can help determine whether anxiety, medications, circulation, hormones, or another underlying issue could be contributing. If erectile dysfunction is diagnosed, treatment depends on the underlying cause. Lifestyle changes, counseling, or prescription medicines may be considered when appropriate.