Go For Dong Pride!
Behold the beauty of the Colours Pride Edition Dong from NS Novelties! It comes in your choice of six or eight inches of rainbow dong fabulousness. It is made of nonporous silicone which means that it is easy to clean and will come (heh) clean with a simple anti-bacterial soap and warm water washing. They have a lovely, smooth texture and you will want to make sure that you have some water-based lube to use with these bad boys. Silicone toys and silicone lubes can sometimes not mix very well and you don't want your new rainbow sex toy to get trashed, do you?
These are firm dongs which makes penetration with these a breeze and really, nobody wants to get fucked with a floppy dong. It has a strong suction cup at the base (hello, shower self-love!) and it is definitely strap-on compatible so that fun option could be totally enhanced with one of these. If I had my own cock, I would totally want it to be rainbow-hued, unless that meant I had a disease or something. Rainbows just make great things better.