I Don't Get This Joke, Please Help Me!?

Question

A man and a woman were waiting in line at the hospital donation center.

Man: 'What are you doing here today?'

Woman: 'Oh, I'm here to donate some blood. They're going to give me Rs. 200 for it.'

Man: 'Hmm, that's interesting. I'm here to donate sperm, myself. But they pay me Rs. 1000.'

The woman looked thoughtful for a moment and they chatted some more before going their separate ways. Several months later, the same man and woman meet again in the same line.

Man: 'Hi there! Here to donate blood again?'

Woman: (shaking her head with mouth closed) 'Unh unh.'

I Just Don't Get The Joke...Will Someone Explain It?

I Also Don't Get This Joke, Again, Please Help!

A doctor gets a visit from a patient who is not able to get an erection.

Doctor: Are you married?

Patient: No.

Doctor: Do you m********e?

Patient: No.

Doctor: Do you visit prostitutes?

Patient: No.

Doctor: Do you have girlfriends?

Patient: No.

Doctor: To phir khada karke kya calender taangega?

Answer 1

In the first joke, the woman wants to make more money by donating sperm, so she keeps the sperm in her mouth from when she performs oral s*x on a man, hence being unable to open her mouth to answer.

As for the second, I'm not sure, but a good punchline would be, "then what do you need an erection for?"

Answer 2

The first one is easy,she has the sperm in her mouth.

I don't understand the language of the last line in the second one.

Answer 3

maybe the lady is shaking her head saying he is getting too much money for that,more than her or maybe she meant what  kind of life they both had that they had to be doing that.

The Doctor was proberly writing him a prescription for viagra.