Ideally, you wouldn't know when people are having sex, but if you want to tease them, you'd say Eku igbafe o (happy enjoyment)

I must say, you put in a lot of time into putting this together, ku ise, o kare (well done).

Omo Yoruba ponbele ni emi lati Ipinle Osun (I am a bonafide Yoruba from Osun state)