Congratulations_英语成人笑话

while the bar patron savored a double martini, an attractive women sat down next to him. the bartender served her a glass of orange juice, and the man turned to her and said, "this is a special day. i'm celebrating."
"i'm celebrating, too," she replied, clinking glasses with him.
"what are you celebrating?" he asked.
"for years i've been trying to have a child," she answered, "today my gynecologist told me i'm pregnant!"
"congratulations," the man said, lifting his glass.
"as it happens, i'm a chicken farmer, and for years all my hens were infertile. but today they're finally fertile." "how did it happen?"
"i switched cocks."
"what a coincidence," she said, smiling.