Oh yeah, of course. Honestly, a lot of the mature stories I develop have their NSFW scenes drawn/written out first before I ever create the actual plot. My Demon Valentine had porn long before I finished the actual story. Actually has two doujinshis in the making. And Our Universe has more NSFW scenes in season 3 (mostly nudity and some hints to sex).
Point is -- if my characters are 18 and older, I've made smut for them. And I've happily shared them in the discord servers I'm a part of. Which brings me to the next part:
Nope. Never once ashamed. Very much open about sexual content, and I'm kinda an avid member of most NSFW art chats in discord servers. That said, I do keep my NSFW art separate from my main works. I have a NSFW twitter for this reason, and I do this because I know I have readers/followers who may be minors.
Hence, while my comics MAY have NSFW scenes, I either leave those for Patreon/Twitter and provide the cleaner versions online (though for Tapas, I just put them behind the Mature tag). Rather than being ashamed, I just don't wanna make it easier for kids to see my NSFW content, you know?
Honestly, me being comfortable is a result of coming from a household where sex wasn't a taboo. If I had questions about sex, I knew I could ask my mom and not be judged. That, and it's liberating. You understand what you do and don't like as a person who may or may not dive into sexual content. Hell, sometimes, making NSFW doesn't have to just be sexual. Sometimes, it's about the aesthetics, the same way one may draw the naked body. That, and let's face it -- if you dig around long enough, there is a lot of amazing NSFW content with great art, plot lines, and acting. I see it also from an artistic POV and it's an field that ought to get more respect.
Also monster romances.