Interesting question considering something I was thinking about the other day. After an intense session last week I was thinking of the different drives/urges for sex.
Intimacy = Obviously the desire to be intimate with someone as an expression of love, to share pleasure with someone is a connection that is, naturally, intimate.
Hedonistic = A desire for pure unadulterated pleasure that might not actually be a reflection on the partner.
Orgasmic = Different from hedonism in the respect that I think many people, myself included, might often want sex for the pure release of frustration or end goal. Think of the difference between eating for pleasure and just eating to satisfy hunger.
Submissive = A desire to be the object of someone else's desire.
I avoided reproduction because it is either calculated (thus not an actual 'drive') or arguably the overriding drive for all these strange 'feely drives'.
I suppose there are other drives we experience but I never got that far in my rather sketchy overview of sexytime urges!
Doesn't the above makes me sound rather Sartrean? Must be utter bullshit then, soz about that.
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As for the actual OP: all sex should be fun and generally intimacy rears it's head during/after sex for me and the primal-ness is optional!