useless trivia: What Word Means: To Swell - To Increase?

Questions

Sperm is the smallest single ____ in a mans body?

Estragon protects against _____ disease?

Hair, prompted by testosterone, grows faster in men in anticipation of _____?

An average, in America, three sex change operations are performed _______?

In 1977, Napoleon's _____ was sold in Paris for about US $3 800 to an American urologist?