BEIJING, July 25 (Reuters) - Young Chinese couples should think twice about getting too affectionate in public in the Chinese capital -- the chances are they are being watched, state media said on Wednesday.

"A comprehensive closed-circuit TV camera network in Beijing sees all," the China Daily warned.

Security authorities said the cameras were there to make the public feel safe, a vital issue ahead of next year's summer Olympics.

"Eye-catching bilingual signs will be put up to remind the public to 'watch your behaviour' when entering areas that have camera surveillance," the newspaper said.

It quoted Jian Bo, 20, as saying the cameras were in the public interest.

"But I don't think I'll alter my habits. Public displays of affection are fashionable, particularly for me and my girl."

In the financial hub of Shanghai, more teenage girls had been calling the city's only accidental pregnancy hotline since the summer vacation started, the newspaper said in a separate article.

"We have seen a 12 percent increase in phone calls, and a 23 percent increase in abortion procedures," a doctor was quoted as saying.