请语法专家进!谁可以给我分析下这个句子,尤其是分词做什么成分?

请语法专家进!谁可以给我分析下这个句子,尤其是分词做什么成分?It's just two people going out to dinner and not having sex.(出自六人行第一集)大家有两种意见,分词到底是做定语还是做状语呢?只要能解释明白了,我可以再送一百分的,甚至再多一些都可以.我实在是想弄清楚它还有如果it是做主语的话,表语怎么会two people是呢,这样写不通啊!我把前面的文章也打了下来:Monica:There's nothing to tell!He's just some guy I work with!Joey:C'mon,you're going out with the guy!There's gotta be something wrong with him!Chandler:All right Joey,be nice.So does he have a hump?A hump and a hairpiece?Phoebe:Wait,does he eat chalk?(They all stare,bemused.) Phoebe:Just,'cause,I don't want her to go through what I went through with Carl- oh!Monica:Okay,everybody relax.This is not even a date.It's just two people going out to dinner and- not having sex.