Use 'lovemaking' in private, adult conversations. It can be inappropriate in casual or public settings. The movie showcased scenes of lovemaking, so it was rated for adults only.
Pro Tip 2/3
Cultural Variance
'Lovemaking' can imply different levels of intimacy depending on cultural contexts, be mindful of this. In some cultures, public discussion of lovemaking is a taboo.
Pro Tip 3/3
Emotional Association
'Lovemaking' often suggests a deep emotional connection, not just a physical act. Their lovemaking was a true expression of their deep love for each other.