Is it normal to get turned on by drawing sexy ladies?

Idk how you're doubting that this isn't ok.

yes its ok

No matter what age, it is something men imagine. Do men look at Playboy mag and do the same, but are not as creative? But ask yourself is it enjoyable or are you not spending time with women? I am not a psych but you may have commitment phobia.
The main thing is your an artist with an imagination and that is your subject. I don't see a problem.
I am an artist and when I draw my men from life I enjoy all the detail. So much so that boyfriends get upset! Too bad, its my job.

erotic art comes to mind .

Yeah woman are sexy! only normal to get turned on while drawing them if you have the ability to draw right?

it cool, unless you are a sexy drawing yourself.