I find it very sexy as well. I get even more turned on when I cum and she is willing to swallow it or just simply take it in her mouth. With me it is that taboo thing that not many woman are willing to do, yet, she is willing to do it for me. I would never ask her to do it or get upset if she didn't, but when she does it out of her own free will, it's like she is willing to do anything to please me and that is a big turn on for me. So I guess yes, it is a turn on. Be careful as to not earn a reputation of the "swallowing queen" if things didn't work out between you two. You should take precautions as to who's sperm you are swallowing and why, unless you just like it to please yourself as well. Take care of yourself always.