It feels like you have a penis inside you. Otherwise, what it feels like depends on a myriad of factors- how aroused you are, how comfortable you are, whether or not you're tired, how your partner is feeling...there is no one way that sex "feels," at least not for me.
I'm not going to toe the line here and tell you exactly what it feels like or is like to have sex. I think strangely enough it was Stephen King who described it as "an awful lot of rubbing for a little bit of warmth." Often it is not so much a physical experience for me as an emotional one and I don't mind that at all. Expecting sex to be mindblowing and physically fantastic every single time just isn't realistic...I prefer sometimes to have sex for emotional reasons, not just physical ones.
I suppose sex could feel like masturbation, depending on how you choose to masturbate, but everything is different with a partner. Not necessarily better or worse, just different. My orgasms with my partner are different than the ones I give myself, but in a way are more rewarding because I get to share in it with someone else.
What you experience and what your friend experiences will in all probability be completely different, because you are different people and your lovers will be different people.
Sex feels like sex is supposed to feel when it's consensual and safe. That's the best I can do to tell you what it feels like. if it feels physically good, that's normal. If doesn't feel like much, that's normal. It all just depends.
I will add, however, that it took about three and a half months before sex felt like much of anything to me. I don't really know why that is but what it felt like changed a lot after that.
Sex is about a lot of things- sights, sounds, emotions, physical sensations. To even attempt to describe what a combination of all those things is like is difficult...it's hard to put it in words. It's just a feeling.
[This message has been edited by laurencsi03 (edited 12-13-2004).]