Not sure about other phones, but mine only unlocks with fingerprint activation. Although it does have a smart unlock function that you can set for when you are home, so it recognises your home location and dosen't apply the lock. Although @aberdude would have a fit, knowing i've got the location turned on.
mine unlocks with a code that only I know. i also lock my laptop. it annoys the Mrs as she is curious (as they all are) as to why it’s locked, I have nothing to hide but enjoy winding her up
If I show a photo on my phone to my Mrs she just takes the opportunity to start scrolling through all my photos. All sorts of daft **** has been posted on Whatsapp during Corona lock down that she doesn't need to see. She also regularly asks why I take photos of my breakfast!
My old dear does the same ffs. She's stopped doing that now since she saw some pics of my missus in the shower.
My Mrs has got loads of pics on her phone of the birds she does beauty work for. Nowt better than a tidy tanned crumpet with a nice round bum.