Erectile difficulties (erectile dysfunction or ED) means that you have difficulty in obtaining and maintaining an erection, which makes penetration difficult or impossible. In some cases an erection is never obtained.
This can be very upsetting for both you and your partner, who often feels to blame and so the associated stress becomes cyclical.
If there is no medical reason for your erectile difficulties, then sex therapy combined with a cognitive behavioural approach can be can be extremely effective in bringing about improvement.
When there are no medical reasons why your erectile difficulties have occurred, sex therapy can still be very helpful in helping you and your partner to explore ways of adapting your sexual relationship to the difficulties.