Portland police have arrested four men in a crackdown on prostitution in the city. City officials say the men were arrested Sunday night after each offered an undercover police officer money for sex in the Parkside neighborhood. They are charged with engaging a prostitute. Those arrested were a 61-year-old man from Westbrook: a 29-year-old man from Portland: a 55-year-old man from Portland: and a 32-year-old man from Naples. City spokeswoman Nicole Clegg says police are cracking down in response to the neighborhood association’s request for “stepped-up enforcement due to the negative impact of prostitution on their community.” Clegg says woman who live in the neighborhood are followed and propositioned by men seeking sex.