There are many reasons why men can't get or keep an erection, and to find the exact reason why your husband is having trouble, you need to do a full evaluation. Some possible causes are:

Diabetes, heart disease, chemical changes, or problems with the nervous system can all make ED worse.

Lifestyle Factors: High amounts of worry, smoking, drinking too much alcohol, bad nutrition, and not getting enough exercise can all affect sexual performance.

Psychological Factors: Stress, sadness, or problems in relationships can make it hard to perform sexually.

Medication: Some drugs may have side effects that affect how well you can sex.

Age: The way your erection works can change as you get older.

Encourage your husband to talk to you openly, and suggest that he get professional help from a doctor or urologist. They can do a full check, deal with any underlying problems, and suggest the right treatments or changes to your lifestyle to make your erection work better. It's important to treat the problem with understanding and help.