Prostitution

Noun

1. Engaging in sexual activity with another person for pay.

   "His addiction brought him to the point that prostitution was the only means he had to survive."

2. Engaging in sexual activity with another person in exchange for goods (not necessarily money) or services.
3. Debasement for profit or impure motives.

   "The television advertising job was a prostitution of the talents of one of the great writers of the century."