Directly speaking, no, because the tracts are totally different. But any semen spilling near the vaginal opening carries a risk of pregnancy, so please use a condom to be completely relaxed and safe.
Having PCOS made me research conception extensively. While the act itself doesn't cause pregnancy, any accidental transfer of semen to the vaginal area can, so don't take chances and always use protection.
Oh, these are things we can never talk about at home with elders around! But realistically, if there is any fluid leakage near the vaginal area, there is a risk, so better to be very careful.
In my experience, sperm can easily leak or slide over to the vaginal area if it is close by. So even if it's not direct vaginal sex, it is always safer to use protection to avoid any chances.
Biologically, the digestive and reproductive systems are separate, so it cannot directly lead to pregnancy. However, my doctor explained that if semen gets onto the skin near the vagina, sperm can swim up, so barrier protection is highly recommended.
