Sexual encounters - CONTAINS SPOILERS
On Wiki it says "After Lisa's sexual encounter with Paul, and a subsequent one with Caije, she discovers she is pregnant and has an abortion. Lisa confronts Caije, telling him of the abortion in the presence of another teacher. She expresses doubt about who the father was and mentions that there are two possibilities."
First of all I'm not not sure if she actually was pregnant and thought it was more a metaphor when she told the abortion story but even if she did have an abortion, when did she have sex with Matt Damon's character? They kissed a bit and then he broke it off while both were fully dressed but they didn't have sex. Did I miss something or watch an alternate version?