Okay a little difficult as we have different opinions of nice bar and then add your other requirements of sexy ladies and jazz/disco, also I have assumed you are staying in Patong (if not the following advice is useless). So here are just some suggestions:-
Saxophone Bar on Beach Road, live Jazz and Blues bands every night, nice decor, okay food, not many sexy ladies unless you strike it lucky, usually filled with Farang and their families.
Almost next door to Sax bar is Rock City, live rock tribute bands every night, good atmosphere, shots and again packed with farang but usually quite a few sexy ladies.
Nice late bar, means do not go until after at least 11 oclock is La Baja, which is opposite the entrance to Holiday Inn next to Tropicana Hotel, very nicely decorated usually have good DJ, but can be a bit hit and miss as not too popular because slightly out of the main streets, but very well decorated and nice bar to take lady too.
Night clubs are all centered around Soi Bangla and probably as well you use search facility on here to get different opinions on which is best etc, for my opinion to select one good to take a nice lady too, early go to Banana on Beach Road, say from 11 to 1pm, later go to Tiger in Soi Bangla, neither unfortunately play jazz but more a mixture of old disco music but both will be filled to the roof with sexy ladies.
Other than that probably pick out some of the better quality restaurants with good atmosphere for a romantic night together, probably suggest Baan Rim Pa or Joe's Downstairs which are located next to each other just out of Patong on road to Kamala, should be 100/150 baht by tuk tuk.
Hope this helps