You say you have no gal fren, so how did u manage to get
consensual sex? Sex wif galfren is safe because u know her better
and where she has been, therefore reducing probability of catching
STDs. You can catch Hepatitis D and E via saliva which could lead
to prolong liver disease and damage. Hepatitis is very commonly
transmitted thru oral sex. My cousin contracted Hepatitis while
sharing food with a co worker who has contracted the disease. Yes
risk is everywhere but by having consensual sex thru one night
stands, you are raising the risk. Find a galfren, have a mono
partner relationship then you can start to enjoy consensual
sex.
Consensual sex with prostitutes (I am not saying you are having)
may produce moral dilemnas. It may not affect you right now but in
future your view of women and family could be affected because of
the moral consequences that you may choose to do. It can produce
effects on your subconscious actions.
However, if u met somebody from the night club and go for one
night stand, tat is a different case because u don't know where
that somebody has been. Even condoms don't fully protect you 100%.
There could be microscopic holes or defects in the condom.
Having said this, leaving your condoms around to be spot on by
your sister, isn't exactly a very good thing. Its like leaving your
diary wide open. If you see your sister leaving her dildo or birth
control pill around, won't you complain as well?