ky does apparently make it hard for the swimmers, but i am sure there are gazillions of people who have gotten pg while using it. robitussin is sometimes used to thin out the cervical mucous if a woman tends to not have a lot of watery or ewcm, or for women on clomid because it can dry up your cm. but cm is not the same as arousal fluid. i wouldnt take robitussin for vaginal dryness/arousal fluid issues because you would have to take it all the time, (and not sure whether it would help much with that or not anyway.) if it's a cm issue, you just need to take it for like 3 days before o. pre-seed is the only commercially available vag lubricant that is supposedly not harmful to sperm. saliva is harmful to sperm, so are oils, so you have to be careful with home remedies too.