Okay, so sexy is not the right word, but I will respond to what I think you are trying to get at and what my preferences are.
I like women who are talented and sporty. I like women who are outdoorsy and are not afraid to work or get dirty. The instruments that I would prefer would be the piano and the guitar although I admire talent with any instrument. The guitar is among the more versatile use anywhere anytime kind of instruments and the piano is sort of fundamental and piano skill is appreciated and needed in many contexts.
So an instrument, or sport, or horseback riding, or car, or whatever don't make a person sexier, but they might make a person more interesting.
You ask the weirdest questions. Who thinks horse back riding and turn-on or turn-off, or which musical instrument and sexy? You seem to have weird things paired up in your mind. I like musical instruments, and sometimes the girls who play them are sexy, but which instrument she plays does not make a difference in how "sexy" she is.
I want to say singing, the voice is my number one, then the violin, then saxophone, why? . . . I dunno? I think it's a combination of things for me. The timbre of the sounds of the instruments, the setting it's being played in and the performer all add to the element.
i would have to say a girls vioce is her number one instrument. As far as Websters defintion of instruments go I would say a violin. Its graceful and it sounds great. unless your playing devil went down to georgia. although that is a great song. just not sexy
1.piano 2 cello violin 3 clarinet, guitar is bad for girls cause that would both deform their hands and its a boy instrument.i would become madddllly in-love with a girl who can play beethoven appassionata or cello suit no.1 :))
Guys who can play the piano really really well, that is hot. I love guys who can play piano...I guess because I can play piano, but whatever...it would be awesome if we can play a duet together, but it's not a requirement