Dalliance
WordNet
noun
(1) Playful behavior intended to arouse sexual interest
(2) The deliberate act of delaying and playing instead of working
WiktionaryText
Noun
- A trifling away of time - dawdling.
- Amorous toying - flirtation.
- A sexual relationship, not serious, often illicit (often used in plural in describing someone who has many such relationships, either consecutively or over time) - affair