Why doesn't my new female friend introduce me to her male friends?

[TamedTiger]

She meets just boys at their place and sleeps over by them. They all sweet talk her and she likes it. She told me her mother trusts them but my gut feeling is nagging me that she's being dishonest about what she does with them. She tells me it's meetings and that she knew them foreve. And she even told me she would never invite me.