From “Ti piace sdraiarti sull’erba”.
For English learners. This should read: “You like LYING on the grass”. Lay can be used (past) “She lay on the grass to sunbathe” (Lei si è sdraiata sull’erba…). “She was lying on the grass”.
Also: We are “laying the table” and chickens are “laying eggs” but we are “lying/lying down”.
Ciao!