My Husband Is 65 Yrs. Old And Had Stroked. He

My husband is 65 yrs. old and had stroked. he likes to masturbate as I discovered lately. I hear that they can ejaculate without an erection is that true? I can not asked him questions because if his irritability. So I just leave it that way. during his visit to his doc. they found out that his has a heart murmur and anemia. I talked maybe that's the cause of masturbation. It exert too much effort to his heart and losing nutrients from his body. Just my opinion. Need your advise. Thank you