If a man cannot satisfy his wife properly because of sickness or weakness in his penis, is it allowed for the pair to use artificial means/products to satisfy her?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.

It is not permissible for a man who is sexually weak or impotent to use artificial devices in order to satisfy his wife's desires; this is discussed in Fatwa: 87620. However, it is permissible for him to use some products to stimulate his desires as clarified in Fataawa: 86812 and 87668 provided that such products do not cause any harm.

Therefore, we advise you to seek treatment and take the approved means while relying on Allaah and putting your trust in Him. It is confirmed that the Prophet said: "Aspire to what benefits you (obeying Allaah and inspiring to His treasures, seeking His help) and do not be lazy (in performing good deeds or seeking His help)." [Muslim]   

Allaah knows best.