[small female perspective]
<-- 5 ft tall ... and small-ish. 
large cocks 
are intimidating. inherently. 
1. stretch her out first. some good fingers are sufficient. 
2. lube. be liberal and generous. I find the silicone stuff to be much better than the glycerin, which stings when things stretch a bit, in my experience. 
3. slow. while you're trying to squeeze your cock into her, she's probably frantically trying to 'expand/relax' to accomodate. 
it can/will happen, it can just take a bit. 
can't just cram it in, ya know?
