Well, this only works underwater and is a very effective clitoral stimulator… I think it has been discontinued by Lovehoney since I got mine though. Probably too pricey for it’s limited usability.
I personally, have had no problems using certain toys in the hot tub without issue. Wands (waterproof ones only, obviously) work very well. My Mantric has had both hot tub and bath outings and suffered no ill effects, though I would definitely advise a thorough water only wash after a hot tub outing as there’re a lot of chemicals flowing through a hot tub that probably aren’t great for silicone. My Mantric Rabbit is also a good bath time play mate, just make sure any charging points are thoroughly dried out before putting away or putting on charge.
Avoid suction toys, mine are waterproof but obviously the vacuum seal won’t work under water if you place it in situ after submerging.
Lubes are trickier, I’ve never tried using them in water. Just make sure you’re really turned on and for penetration, maybe, take it slow and expect a bit more friction as natural juices get washed away too. Sex is definitely not impossible though and very enjoyable, more grinding, less pounding though. In terms of dildos, metal and glass slide in easier in water than silicone does.