The moaning soundtrack

After rewatching the first episodes we got, I realized that the weird moaning soundtrack starts twice when Saxon notices women he wants to have sex with BUT only when Lochlan is here. When he notices Chelsea at the pool, when he has a hard-on, when he comes across both Chelsea and Chloe, and when he goes to talk to Chloe alone, it's other soundtracks playing. But when he's at the pool with Lochlan, the soundtrack starts just before the group of women comes into the frame, continues when Saxon tries to flirt with Chelsea and ends after Saxon and Lochlan finish their conversation. The other instance is when Saxon and Lochlan are once again at the pool, it starts as soon as Saxon notices Chloe and Chelsea walking past them and Lochlan says goodbye to him and it continues in the next scenes with Laurie/Valentin/Jaclyn and even a bit with Gaitok when he sees Mook. I wonder what this is all about.