at the beginning of the movie, a man and a woman share a kiss
leo says to lena "i guess you're virgin" and then he gets naked because she's going to draw him cloth less
a man and a woman kiss.
three of the four stories of the movie are focused on man and woman relationships.
julia mentions that ian asked her to go on a dinner (implying they are heterosexual people)
a woman and a man kisses on a theatre play.
effie asks tibby if she is ok with her dating brian (a heterosexual relationship)
Lena asks Leo if he's ever been in love and how he feels about it
A teenage girl and a teenage boy have sex for the first time: we see them kissing and he's lying on top of her in a petting scene that then leads to them deciding to have sex; he takes off his shirt and the scene cuts there. We see her in the bed after with a sheet covering her chest. He tells her the condom broke, which leads her to fear that she is pregnant. They discuss this several times (although the words "pregnant" and "sex" and "condom" are rarely (if ever) said).
A teenage girl spends all night out on a boat with a man but it isn't clear if she slept with him. It is unlikely.
At a figure drawing class, a man takes off his clothes for nude modeling (we see his upper body and his legs and thighs). Lena appears very nervous before the class starts, and he remarks that she must be a virgin. Tibby later jokes about Lena's reaction saying that he's "a nude model, not a pornstar"
Several teenage girls wear low-cut costumes for a Shakespearean play (there's a lot of cleavage).
A girl asks how to say, "Lost pants" in Greek and a woman replies, "Greek girls do not lose their pants."This is a joke