And with few exceptions, every man has several spontaneous erections each night while sleeping.

This would explain his lack of spontaneous erections.

He doesn't even get turned on - he never has a spontaneous erection.

But when a once-potent patient has erectile problems with a partner and also has no spontaneous nocturnal erections, the drug is a likely cause.

Melanotan is reported to cause mild nausea, yawning and spontaneous erections in trials (not the best combination).

She had certainly improved Devlin's ability to achieve spontaneous erections since her arrival at the castle.

'There was a time when you found it very difficult to get spontaneous erections, wasn't there?'

During puberty, some boys also have spontaneous erections.

Once upon a time, when Stephanie had first met Devlin, his ability to have a spontaneous erection had been virtually nil.