Men in briefs can be very sexy and usually in quite neutral colours like white or black depending on the guy, but also a pop of colour is most nice too.
There’s a few great brands I could recommend but forum rules won’t allow me to name them unfortunately.
I have never been a fan of boxers of any kind . However I think I have had every kind of bikini brief , string bikini and thong that has been made . Check out my photos , there are “several” photos of some of them . For me I love bright contrasting colors , especially when I have a good tan . The hardest part is getting ones that fit snuggly without being too tight . Another note is if you do not trim your all under hair or be totally smooth you can get hair pulled that be surprisingly painful . Enjoy and your partner hopefully will like them .
Just my opinion but i think men in briefs or lingerie looks weird and unnatural. I’ve tried myself and don’t think it’s a good look. But if it makes you happy then why not​
I forgot to add I tried several pair of one sided “underwear” , I liked the concept but even with my modest package it was difficult to get all of me in . Then they generally would work out of position .