This is a hard one actually.
I don't have a particular type, I'll go for anyone really as long as I enjoy their company. Sexy, meaning someone I'd happily shag in my case, comes down to looks not very often. Obviously some level of physical attraction is required, but there's not really one box that I can fit all people I find attractive into.
There are some people I like more than others, and there's some people I find stunning but wouldn't go near them with a ten foot barge pole. Ultimately, I'm quite picky, but it rarely comes down to looks, even if they do have some significance.
A nice smile is good, has to be authentic though. Hair is a hard one, I like the "i don't give a crap" bedhead look as much as I like the prim and proper spent-an-hour-doing-it up look. Similar with make up, I find people with a natural look as great as those that will spend some time "putting their face on".
I like short people, I like tall people, I like slim people, I like curvy people, I like flat stomach, I like a man-bod, I like blue eyes, I like brown eyes, I LOVE green eyes, I LOVE even more those hazel eyes which are a mix of the brown and green, I like people in skirts, I like people in trousers, I like funny people, I like nerdy people, I like it when we share a music taste, I like someone that can introduce me to new music, I like kinky people, I like people who are a bit shy, I like extroverts, I like introverts.
I DO NOT LIKE BAGGAGE! Baggage is a massive turnoff, fine if I can offer support, but when it's constant it becomes a bore and I have to leave.