When a guy cums in me, it stays there... the ass is an effective way to absorb medications, so i believe his gift of cum (and anything else he has) just gets absorbed into my body.
When i was younger i always wanted big chunky, big dicked, hairy guys to cum in me, believing their dna would make me bigger and put some hair on my chest! I took loads, still got a little slim, smooth body but do have a good sized dick! Don't think it had anything to do with the cum from huge cocks! But sure was fun at the time!!!!
Now i take cumloads from anyone, just let it absorb into me.... or find another cock to push it deeper, and mix it up with more cum, never lost control and lost the lot but have been fucked so much that the odd drip has run down my leg after....