Hmmm?, methinks that some here are mixing up sexy with loving, and lovable.
Someone nominated Penelope Cruz as being sexy, which is hard to argue against, even though I find her looks a little strange, a bit like she has all the right bits, but they are not quite put together right to deliver that idealised concept of female perfection.
Personally, I think that this imperfectness possibly raises her up in the sexy stakes, because she is someone we could identify ourselves as being within our reach, while the absolute "perfect" beauties are unattainable.
So basically sexy for a guy means nothing more than how ferkable they think a woman is, or rather how much they would wish to get down and dirty with them.
There are innumerable women I would consider sexy, but far fewer I would consider lovable, and the simple fact is we are looking for that confluence of a woman who is totally lovable, and also highly desirable sexually.
Another element of sexy is the fun component, and women that you can envisage as being that little bit wild, and unpredictable, also adds a few extra points to the sexy tally.
So I would break it down as being about;
Looks-----------30%
Available-------50%
Personality-----10%
with the other 10% made up of things like physical characteristics you personally fixate on, like boobs, or backsides, or even feet or footwear for some, or leather apparel for others, lol
So my ideal woman is pretty, slimmish, outgoing, funny, smart and flexible, in every way.