Dosen't it all depend on who is involved?
Some one once suggested some anal and I was not into it but when the situation presented itself it was totally ok. The trust factor or lack of trust can be enough in of itself.
When I was single, I precieved that sex without some risk was like food with out spice.
Now that I have been married for quite sometime, the sex is a plus however it comes, as there is a greater need for love.

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Sex is a tricky thing best left to professionals.