Two guys - one fat & ugly but with a golden heart, the other is suppose to be handsome (but looks like a vampire to me) and constantly horny; are in love with Mona. They think she is beyond beautiful but she is actually average at best.
Mona is only 22, the guys are older, and Mona imagines herself as an educated sophisticate and sexually liberated. She wants both guys and her to be lovers.
The horny vampire guy is ready to jump in but the fat guy is wisely cautious and rejects the idea. Oh, by-the-way, the two guys are old friends and this issue pushes their friendship to the edge.
Mona leaves, Mona comes back. There's a lot of sneaking around between the guys as to just who will jump in bed with Mona without the other knowing it.
The movie ends wide open so you can conclude the story yourself. Most of the acting is OK and plot easy to follow (even if it does get a bit circular at times). The moving part is best and comes at opening of story.