If you're squimish, look away now!

I was recently prescribed risperidone, and i think it's caused me retrograde ejaculation. I'm not entirely certain if the medication is the cause, so i was wondering whether anybody could shed some light on the topic. Is retrograde ejaculation a possible side-effect of risperidone? i've read before only a number of antipsychotics cause it, and risperidone wasn't listed. Could this ejaculation issue be caused by something else, like a sexually transmitted disease or some sort of other infection, or do you think it is the medication?