I like sex scenes. I like reading them and I like writing them.
For me, the key is that they should serve a purpose, and/or advance the story line.
I've read porn with plot and enjoyed it, but when I'm writing about sex in my book it's a result of or results in something else.
You can also be suggestive/steamy without talking about mechanics. It's all about how you craft it. If you're uncomfortable about how graphic your sex scene is, then ask yourself whether that level is required in order to drive some point home, or emphasize something. Example: couple has just experienced life/death situation and **** graphically/cathartically. If it's just there for 'wow let's have them ****'...well, consider toning it down, but don't delete it.
I also agree with some of the comments here that it will turn off a certain type of audience, but you're going to get that anyway, you can't field everyone's tastes.
Finally, I don't think a story with sex in it should be devalued like it often is. Like jeez...adults have sex, it's ok to talk about it.
Hope that helps!