I started watching a sci-fi movie in late '90 or early '00 on a Finnish channel called MTV3. There was a crashed spacecraft in a forest, much like those you see in the northern parts of the world. A group of boys found it and explored it, they figured out it'd be good way to make cash if they show it to people asking for money. Can't remember how many there were in the group but at least two. Early teens.
Next they had people lining up to see it, I think. Eventually it attracted a team of agents or the like. I think there were three of them and atleast one of them was woman. They planned to check out the crashed ship pretending to be like any other curious person. Before entering the ship, the woman opened up some top buttons from her shirt so anyone could get a good look at her breast. After they had explored the ship, the woman told the other(s) that the boys have been taken over by aliens, when someone else asks her how does she know, she says it's because they didn't look at her breast.
The movie was most likely made in USA and maybe early or mid 90's.
Other detail I'm not so sure about, but the channel had a theme going around at the time where they showed some b-class movies of the "so bad it's good" variety, this one might've been shown during that time.