use a soft cup (the things used during ur period) and it will help keep the sperm closer to where it needs to be.

tmi but when i got pregnant after me and my boyfriend did the deed I went on my knees and elbows and stuck my tush up in the air for like 5 minutes. it worked xD

You can actuality pee after because where you use the bathroom from and your sexual organs are not connected. So if you had to use it it won't affect the sperm. But once the sperm is in you there's nothing you can really do to keep it alive. It will live for 72 hrs while its in you though.

hot baths, peeing right after douching and that's probably about it