A little ass-smacking and hair pulling is quite often part of fucking for me. MrB reads me very well and knows when I'm in the mood or not. He also know exactly how hard is enough and how hard is too hard. - With previous lovers and fuck-buddies it not sos easy. I don't remember ever asking for it - just liking it when it happened. With MrB tho I just shout out if I want it and he's not doing it. I also love having my clit slapped lightly when I'm really truned on - that makes me cum hard.
Stranguation I'm not into - I have some bondage type gear I like to wear sometimes (collar with wrist cuffs / collar with wrist and ankle cuffs) and a couple times wearing those I've had a little pressure on my throat/windpipe while fucking and I've liked that - but never restricted breathing - that's just not a turn on. I like the illusion of being controlled but the without any actual loss of control.
And that's what I think hair pulling and slapping is about - if you are turned on by being controlled during sex - be you male or female, some people get off on being their partner's fuck toy. That's my take on it.
Talking of giving up control; I remember one time with a friend we were fucking by an open window and I sat up on the window ledge so he could kneel and lick my pussy. (big, tall georgian sash window - you get about a metre, 3 to 4 feet, of 'open') It was very early in the morning and I leaned backwards out the window to get some air and enjoy the view - this was in the centre of town, overlooking a leafy canal path but surrounded on other sides by offices and residential. I had my hands on the outside ledge and my ass on the inside ledge and he stood up and start fucking me, kinda lifting me up so my ass was more on the outside ledge. He was thrusting quite hard and my hands started slipping towards the edge of the sill. Now I trusted this guy completely, he was my best friend, and he was very strong and fit - so when he pushed me further back and told me to let go I went with it, I let go and leant back. I was three stories up with a sheer drop down to concrete below me and getting totally fucked. He was holding my hips at first but that was placing pressure on my back so he shifted a little way out the window himself so he had one leg in the room, one knee on the window ledge and he was holding me by one leg with his other hand braced against the sill. He took his time, with long slow strokes, lifting me slightly to get balls deep each stroke - then he sped up a little, I was already on the edge of cumming and he kept me there for a few minutes - then somehow managed to brace with just his legs and started slapping my clit. At this point I totally lost it - I must have woken up half the neighbourhood. That make him cum too and he let he knee drop off the outside of he sill as he pulled my leg back up into - though he had to leave off my clit to grab the window frame to stop us falling. Then he reached down grabbed my hand and we fell back into the room in a panting, sweating heap. A totally amazing fuck...