A celebration of a friend, family or loved ones birthday on the day of the month they were originally born (ex: Someone born in August 3rd celebrating their 30th birthday.) A birthday party will usually involve a group of people, a cake with number candles or a specific amount of candles for how old the person is, a birthday cheer and some presents for the person celebrating their birthday. For the posts that also depict a character having sexual intercourse with someone for their birthday, make sure to tag birthday_sex.