Remember the Differential Diagnosis of Erectile Dysfunction using the mnemonic PENIS.
PENIS
- Psychogenic
- Endocrine (type 2 DM, testosterone)
- Neurogenic (type 2 DM, post-operative)
- Insufficiency of blood (atherosclerosis)
- Substances

Hope that mnemonic helped. Got a better mnemonic for the same? Let us know in the comments below.
Also check out these medical mnemonics