Having been party to plenty of both male and female conversation on this point, as well as many such discussions with a mixed crowd.
As it turns out both discuss the opposite gender in a sexual manner sometimes. After all people (or most of them) are sexual creatures.
There are differences, be they social, cultural or genetic I don't know, but its a couple of HUGE differences.
-women in conversation with other women are explicit and detail orientated to the same degree that men are vague and non-specific. Sure guys might say "Oh I'd hit that like the fist of an angry god" or "I'd hit that so hard if you could pull it out you'd be king of England." But much beyond "Hey baby, you looking good" is pretty much out of order. Listening to girls talk about guys and sex with other girls, no detail gets left out, every point is critiqued. They never would go - as guys do - "Hey, I got some last night," which after the pro forma congratulations is as far as it EVER goes. Techniques, details, positions, kinks are not brought up as a rule for guys, but for girls they seem to be the real point is that kind of comparison.
- Guys tend to talk about far more targets then girls do. That not because men are somehow oversexed compared with women, its because women are a hella lot more picky.
- Guys, being not very bright do tend to only focus on the physical/sexual, they can only think of one thing at a time. Women focus on a lot more, and for everyone out there who thinks that men see women as sexual objects first and people second, I can introduce you to a hella lot of women who are more turned on by your income then your body and see men as a financial object first, and a person second.