you're in despair? take it up with kierkegaard, read some 'sickness unto death'
now, as Miz S said, use a condom! it's not that hard, it isn't uncomfortable, and it's not too small. besides, sex takes longer with a condom -- no wham, bam, thank you ma'am.
as for cervical mucus, i just had a test on this, so i'm gonna regurgitate all the stuff i learned about it.
birth control pills suppress luteinizing hormone, the hormone that triggers ovulation. it also makes the mucus really sticky. those are the two ways the Pill works to stop pregnancy.
but y'know what? it doesn't stop disease, so you might not be eating for two 6 months down the line, but you might have a nasty rotting, festering, gooey, putrid, smelly infection in your nether-regions thatm ight never be cured if you do not properly apply a condom.
have a nice, and SAFE, day
Maurice! Bring in the albinos! muwahahahahaha!!!