Should I be allowed to buy the first two seasons (more inside)?

tu should be if it dosen't bother tu and you're parents are fine with it, but unfortunately it has an age restriction for a reason, (In the UK its an 18) so people know what it contains. Instead of people buying it when it has a low age rating and for example thinking it will be like buffy the vampire slayer, (In the UK BTVS is a 15) then having a bit of a shock when they watch it. Unfortunately its down to age, but its for a good reason. :)

If it didn't bother tu I don't see why tu shouldn't.
But I can see why your mom doesn't want tu to have the DVDs... it's not exactly the most appropiate mostrar for a 15-year-old to own...

I personally feel that if she knew you've watched and read the series, I don't see the harm in buying the seasons on dvd since the damage is already done, so to speak. That doesn't mean tu should go against your mom if she dicho no, because she probably has a good reason for her decision, like she dosen't want tu to waste your money....or something.

I looked up the TVMA age and its meant not suitable for children under 17. I think thats a bit steep actually, tu can't buy the series, yet your fit to earn your drivers learners (or atleast tu could when I was 15) lol.