Irregular Sex?

[iLoveVball]

When I had sex with my girlfriend recently when I tried to penetrate her it was much harder than before, normally my dick kinda just slides in without effort, but this time recently I actually had to force it it in. What caused her to be tight this time? what it the position we were in (missionary)?

[Colour Fadeout]

Was it lubed up properly?

[nick]

Probably a different point in her monthly cycle, can make a big difference to the amount of natural lubrication she produces.

[Weeping]

If I'm right it can get tighter when we're about to get our period soon.
It may be by the ovulation (is that the right word? xD), but I'm not really sure.
Well.. It may be because of the period.
Or.. If it wasn't wet enough? Or maybe her body wasn't really ready yet..

It could be a lot of reasons, but it's probably nothing wrong! :D