I will occasionally squirt but I must admit I have never squirted getting fucked. The best way to make me squirt is to lick and suck my clit while hitting my G-Spot with a G-Spot vibe. This in combination with anal stimulation (usually anal beads) does the trick for me. I will usually cum in waves with each wave getting more intense. When my body begins to shudder, pull out the anal beads and that will usually bring me to a very intense climax and I squirt. It is more of gush than a squirt. I have never squirted like you see in porn vids where it shoots out like a hose. It is more of a gush but usually a lot of it!
But what works for me may not work for you. And I was never able to squirt until I was about 35. At that time I was much more comfortable and in tune with my body!!
Hope this helps!
I only squirt when playing with my hitachi magic wand. It's more of a gush rather then a squirt. I have not done while having sex though.
With a couple ex's It's been with the magic wand, and usually a thick dildo (thick being the key). You can also use the wand at the base of the dildo to send vibes up threw.