Octanu,
try to get yourself in a sexual state, so your voice comes from a more grounded place. It sounds simple, but can be hard if you're not present to the moment. I have found that right after sex, my voice is the sexiest. When I actively try to lower my voice and talk sexy, it comes off incongruent. An exercise I like to do is "talk to the wall" and practice free association while staying in a sexual state or simply be present to the moment. You can play around with this, and you'll find that you can actually get to that sexy voice without doing anything but feeling the sexual energy inside you. As you get more practice doing this, you'll get better at tapping into it.
Watch the most recent video of Tyler on his freetour. He has a segment where he played around with his voice to demonstrate sexual intent and freedom from outcome. The difference is huge. Just remember think -> feel -> project.