A game that has effectively taken every single system from the first and fleshed it out tremendously.

FO2 added sex.
That's fucking awesome :'D.
There's a formula to determine how good you are at sex, as follows:

(CH 50 + EN 25 + AG 13 + ST 12)
------------------------------------------------------------ + (SEX PERKS) > 9
100
I studied this formula meticulously, to craft the ultimate sex pest.

I started by fluffing the male porn stars in New Reno for most of August.

Depending on how much you fuck, you can receive various reputations regarding it. There's an option to use a condom if they're in your inventory. I ensured these devices of Moloch were never on my character. I ensured my obj_sex_rating was as high as possible at all times. Once I had sex ten times, I was delighted to find out that my sexual dialogue improved and I was given the "Gigolo" title. My addiction to Buffout and Jet was wearing me down, and the "poison" debuff in my mouth and groin did me little favors.

I eventually fucked a mob bosses daughter. I subsequently told her mom, who proceeded to tell me she was better in bed. My sex stats gave me more pillow talk options, in which I asked about her husband. I later decided it was in our best interest to kill the entire Mob Family (the daughter and my unborn child were caught in the crossfire - RIP)

I eventually bet my anal virginity to a super mutant over a game of arm wrestling. I woke up with a ball gag in my inventory. I got so mad that I decided to blow up an oil rig.

Also, I wrote like a real 6 paragraph review and then deleted it to post this one instead.