Embarrassing Problem

A man went into a pharmacy and asked to talk to a male pharmacist...
The woman he was talking to said that she was the pharmacist and that she and her sister owned the shop, so there were no males employed there. She then asked if there was something she could help the gentleman with.
The man said, 'This is embarrassing for me, but I have a permanent erection, which causes me a lot of problems and severe embarrassment. I was wondering what you could give me for it?'
The chemist said 'Just a minute, I'll go and talk to my sister.' When she returned, she said, 'The best we can do is one-third ownership in the shop and