ok. I’m a man, maybe a bit old for you but a man none the less. I am from New Zealand now living in Australia, But have live in Thailand China and Russia. So I think I have some experience in which to answer your question.
The short answer is these men are just Pigs, quite simple. If conversation is about sex then just delete them. simple.

to qualify. Based on my life experiences.
the peoples of every country and couture have different attitudes towards sex. Russia or Russians are much more open about sex than say either New Zealand or Australia for example. a New Zealand girl would not tolerate and sexual conversation PERIOD. Yet you feel you have to ask a question about this because you are unsure?? That is an enlighten difference there.

To generalise. Russian girls are much more attractive than most in Australia. There are many factors for this diet being the first. Russians walk much more Australians drive. The sun is another factor, the High UV of the southern hemisphere is very damaging to the skin. If you are really interested look at an Australian dating site then look at the girls of the same age. a Russian girl of 40 can usually pass for 30 in Australia.
Russian girls also look after them self’s much more, dress better, and are the best flirters in the world. Australian girls have a more take it or leave it attitude ( hard to explain ) the result is that when an Australian man is talking to a Russian girl who is trying!!! the Australian man will actually think that that is how you are 24/7 since an Australian girl will never try.