Where I masturbate: Usually in my room. Sometimes on the bathroom, because I like doing it with a mirror. When home alone, i the living room. What do I do with the sperm? Usually, I jack in my underpants. But sometimes, when it's late at night, I jack totally naked, so I wipe of the sperm with a tissue.
Normally I use a tissue, a sock or someone's panties if I can get hold of a pair. But when I am away from home and staying in a hotel then on my last night I simply masturbate laying on my side so that i can ejaculate directly onto the sheet. I usually repeat the exercise and do it again the next morning but this time turning the other way so that there are now two stains - on both sides of the bed. I have also on occasions ejaculated onto the pillow.
It's normal to masturbate anywhere there is privacy or with someone (your choice) I live alone and usually I am in my bedroom with my laptop, I used to cum in a sock , then on my stomach/chest, recently I use what I call a cum towel/cloth I use it a few times before washing it.