I have a pair of boxer briefs that I use for jacking off. When I'm about to cum, I wrap them around my dick and shoot a load in them to eliminate any mess or clean-up

Now, what I'm wondering about is how good they smell. I just grabbed them earlier and caught a whiff, and the smell was incredible. I expected them to smell absolutely rancid as I've been using them for a good while with no washing, and I already jacked off earlier today which had left them still a bit damp with semen, but they smelled more like some kind of sweet pastry. I just ended up sniffing my soggy, cum soaked boxer briefs in confusion a couple more times, because the smell was so enjoyable. Absolutely bewildering

Now, how can this be explained scientifically? Why do my used up cum briefs smell so good?